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Problem:

https://www.geeksforgeeks.org/problems/swap-major-and-minor-diagonals-of-a-square-matrix/1

Swap diagonals
Difficulty: Easy Accuracy: 85.42%
Given a square matrix mat[][], the task is to swap the elements of the major and minor diagonals.
• Major Diagonal: Elements that lie from the top-left corner to the bottom-right corner of the matrix (i.e., where row index equals column index).
• Minor Diagonal: Elements that lie from the top-right corner to the bottom-left corner (i.e., where the sum of row and column indices equals n - 1).
Examples:
Input: mat[][] = [[0, 1, 2],
[3, 4, 5],
[6, 7, 8]]
Output: [[2, 1, 0],
[3, 4, 5],
[8, 7, 6]]
Explanation: Major Diagonal = [0, 4, 8], Minor Diagonal = [2, 4, 6]. We are required to swap the diagonal elements of same row, thus after doing so, major diagonal will become minor and vice-versa.
Input: mat[][] = [[2, 3],
[5, 4]]
Output: [[3, 2],
[4, 5]]
Explanation: Major Diagonal = [2, 4], Minor Diagonal = [3, 5]. We are required to swap the diagonal elements of same row, thus after doing so, major diagonal will become minor and vice-versa.
Constraints:
1 ≤ mat.size() ≤ 500
1 ≤ mat[i][j] ≤ 106

Solution:
class Solution:
def swapDiagonal(self, mat):
n = len(mat)
for i in range(n):
mat[i][i], mat[i][n-1-i] = mat[i][n-1-i], mat[i][i]
return mat