Matrix Diagonals

For the 3×3 matrix in the starter, print the sum of the main diagonal, then the sum of the anti-diagonal.

22
18

Main: matrix[i][i]. Anti: matrix[i][len(matrix)-1-i].

matrix = [
    [5, 1, 3],
    [2, 8, 4],
    [7, 6, 9],
]
n = len(matrix)
print(sum(matrix[i][i] for i in range(n)))
print(sum(matrix[i][n - 1 - i] for i in range(n)))

Run your code to check it…