Problem
Given a matrix, print the sum of all elements that are unique in both their row and their column.
Input format
Input
input.txt
- Two integers N, M (1 ≤ N, M ≤ 20) - N rows with M integers
Output format
Output
output.txt
- The sum.
Example
input
3 3 1 2 3 2 2 4 1 4 5
output
5
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Sample cases (from the problem)
Sample Case 1
Input
3 3 1 2 3 2 2 4 1 4 5
Expected output
5
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