Leetcode 2319 Check if Matrix Is X-Matrix Solution in c++ | Hindi Coding Community

 

A square matrix is said to be an X-Matrix if both of the following conditions hold:

1. All the elements in the diagonals of the matrix are non-zero.
2. 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

C++ Code :

class Solution {

public:

bool checkXMatrix(vector<vector<int>>& v1) {

int n = v1.size();

for(int i=0; i<n; i++){

for(int j=0; j<n; j++){

if(i==j || (i+j) == n-1){

if(v1[i][j]==0) return false;

}

else if(v1[i][j]!=0) return false;

}

}

return true;

}

};