Swap diagonals in a Matrix

Swap diagonals

Difficulty: EasyAccuracy: 81.55%Submissions: 902+Points: 2Average Time: 9m

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

Expected Complexities

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