Matrix Diagonal Sum

Given a square matrix of integers, calculate the sum of both its main and secondary diagonals. The main diagonal is defined as the diagonal from the top-left to the bottom-right, and the secondary diagonal is from the top-right to the bottom-left. Input format: - The first line contains a single integer N, the size of the N x N matrix. - The next N lines each contain N integers representing the matrix elements. Output format: - A single line with the sum of the main diagonal and the sum of the secondary diagonal, separated by a space. Example: Input: 3 1 2 3 4 5 6 7 8 9 Output: 15 15