Grokking Data Structures & Algorithms for Coding Interviews
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Solution: Matrix Diagonal Sum (easy)
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Problem Statement

Given a square matrix (2D array), calculate the sum of its two diagonals.

The two diagonals in consideration are the primary diagonal that spans from the top-left to the bottom-right and the secondary diagonal that spans from top-right to bottom-left. If a number is part of both diagonals (which occurs only for odd-sized matrices), it should be counted only once in the sum.

Examples

  1. Example 1:
    • Input: 
      [[1,2,3],
 [4,5,6],
 [7,8,9]]
    • Expected Output: 25

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