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