Solving a simple HackerRank problem called: Diagonal Difference using python.

Given a square matrix, calculate the absolute difference between the sums of its diagonals.

For example, the square matrix arr is shown below:

1 2 3
4 5 6
9 8 9  

The left-to-right diagonal = 1 + 5 + 9 = 15 . The right to left diagonal = 3 + 5 +9 = 17 . Their absolute difference is |15 - 17 | = 2 .

See the full description of the problem here :Diagonal Difference

Sample Input

3
11 2 4
4 5 6
10 8 -12

Sample Output

15

Let me know in comment bellow if you got any better solution.