Leetcode 1677 Solution

This article provides solution to leetcode question 1677 (matrix-diagonal-sum)
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https://leetcode.com/problems/matrix-diagonal-sum

Solution

class Solution:
    def diagonalSum(self, mat: List[List[int]]) -> int:
        n = len(mat)

        ans = 0
        for i in range(n):
            ans += mat[i][i] + mat[i][n - 1 - i]

        if n % 2 == 1:
            ans -= mat[n // 2][n // 2]

        return ans