2319 - Check if Matrix Is X-Matrix.

Easy

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

• <code>0 <= gridj<= 10⁵</code>