| { |
| "id": 2398, |
| "name": "check-if-matrix-is-x-matrix", |
| "difficulty": "Easy", |
| "link": "https://leetcode.com/problems/check-if-matrix-is-x-matrix/", |
| "date": "2022-06-19", |
| "task_description": "A square matrix is said to be an **X-Matrix** if **both** of the following conditions hold: All the elements in the diagonals of the matrix are **non-zero**. All other elements are 0. Given a 2D integer array `grid` of size `n x n` representing a square matrix, return `true`_ if _`grid`_ is an X-Matrix_. Otherwise, return `false`. **Example 1:** ``` **Input:** grid = [[2,0,0,1],[0,3,1,0],[0,5,2,0],[4,0,0,2]] **Output:** true **Explanation:** Refer to the diagram above. An X-Matrix should have the green elements (diagonals) be non-zero and the red elements be 0. Thus, grid is an X-Matrix. ``` **Example 2:** ``` **Input:** grid = [[5,7,0],[0,3,1],[0,5,0]] **Output:** false **Explanation:** Refer to the diagram above. An X-Matrix should have the green elements (diagonals) be non-zero and the red elements be 0. Thus, grid is not an X-Matrix. ``` **Constraints:** `n == grid.length == grid[i].length` `3 <= n <= 100` `0 <= grid[i][j] <= 105`", |
| "test_case": [ |
| { |
| "label": "Example 1", |
| "input": "grid = [[2,0,0,1],[0,3,1,0],[0,5,2,0],[4,0,0,2]]", |
| "output": "true " |
| }, |
| { |
| "label": "Example 2", |
| "input": "grid = [[5,7,0],[0,3,1],[0,5,0]]", |
| "output": "false " |
| } |
| ], |
| "constraints": [ |
| "n == grid.length == grid[i].length", |
| "3 <= n <= 100", |
| "0 <= grid[i][j] <= 105" |
| ], |
| "python_template": "class Solution(object):\n def checkXMatrix(self, grid):\n \"\"\"\n :type grid: List[List[int]]\n :rtype: bool\n \"\"\"\n ", |
| "java_template": "class Solution {\n public boolean checkXMatrix(int[][] grid) {\n \n }\n}", |
| "metadata": { |
| "func_name": "checkXMatrix" |
| } |
| } |
