Matrix Diagonal Sum Solution | LeetCode 1572

Matrix Diagonal Sum Solution | LeetCode 1572
I have explained matrix diagonal sum solution. Please watch till the end as if you are facing any problem related with matrix or 2D array you will be able to think in this way.

Description
Given a square matrix mat, return the sum of the matrix diagonals.
Only include the sum of all the elements on the primary diagonal and all the elements on the secondary diagonal that are not part of the primary diagonal.

Input: mat = [[1,2,3],
[4,5,6],
[7,8,9]]
Output: 25
Explanation: Diagonals sum: 1 + 5 + 9 + 3 + 7 = 25
Notice that element mat[1][1] = 5 is counted only once.

Please let us know in comments section if you like the approach.

Problem Link:
https://leetcode.com/problems/matrix-diagonal-sum/

Solution Link:
https://github.com/codedecks-in/LeetCode-Solutions/blob/master/Java/matrix-diagonal-sum.java

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