check-if-matrix-is-x-matrix

Check if Matrix Is X-Matrix

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checkXMatrix

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

<ol>
	<li>All the elements in the diagonals of the matrix are non-zero.</li>
	<li>All other elements are 0.</li>
</ol>

Given a 2D integer array <code>grid</code> of size <code>n x n</code> representing a square matrix, return <code>true</code> if <code>grid</code> is an X-Matrix. Otherwise, return <code>false</code>.

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2022/05/03/ex1.jpg" style="width: 311px; height: 320px;" />
<pre>
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.
</pre>

Example 2:
<img alt="" src="https://assets.leetcode.com/uploads/2022/05/03/ex2.jpg" style="width: 238px; height: 246px;" />
<pre>
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.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>n == grid.length == grid[i].length</code></li>
	<li><code>3 &lt;= n &lt;= 100</code></li>
	<li><code>0 &lt;= grid[i][j] &lt;= 105</code></li>
</ul>

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