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public class Triangle {
public enum TriangleType {
INVALID, SCALENE, EQUALATERAL, ISOCELES
}
public static TriangleType classifyTriangle(int a, int b, int c) {
if (a > b) {
int tmp = a;
a = b;
b = tmp;
}
if (a > c) {
int tmp = b; // original: int tmp = a;
a = c;
c = tmp;
}
if (b > c) {
int tmp = b;
b = c;
c = tmp;
}
if (a + b <= c) {
return TriangleType.INVALID;
} else if (a == b && b == c) {
return TriangleType.EQUALATERAL;
} else if (a == b || b == c) {
return TriangleType.ISOCELES;
} else {
return TriangleType.SCALENE;
}
}
public static void main(String[] args) {
System.out.println("INV");
System.out.println(classifyTriangle(1,2,9));
System.out.println(classifyTriangle(-1,1,1));
System.out.println(classifyTriangle(1,-1,1));
System.out.println(classifyTriangle(1,1,-1));
System.out.println(classifyTriangle(100,80,10000));
System.out.println("EQU");
System.out.println(classifyTriangle(1,1,1));
System.out.println(classifyTriangle(100,100,100));
System.out.println(classifyTriangle(99,99,99));
System.out.println("ISO");
System.out.println(classifyTriangle(100,90,90));
System.out.println(classifyTriangle(1000,900,900));
System.out.println(classifyTriangle(3,2,2));
System.out.println(classifyTriangle(30,16,16));
System.out.println("SCA");
System.out.println(classifyTriangle(5,4,3));
System.out.println(classifyTriangle(1000,900,101));
System.out.println(classifyTriangle(3,20,21));
System.out.println(classifyTriangle(999,501,600));
}
}

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