Diagonal Difference

Difficulty: 900 2000 ms 128 MB

implementation

For a square matrix, print the absolute difference between the sums of its two diagonals.

Input: the first line has N and N; the next N lines each have N integers.

Output: |main diagonal sum − anti-diagonal sum|.

Constraints:

• 1 ≤ N ≤ 100
• −10⁴ ≤ values ≤ 10⁴

Sample Tests

3 3
11 2 4
4 5 6
10 8 -12

15

1 1
7

0

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