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贡献一组数据

Posted by lkjslkjdlk at 2013-06-26 23:05:05 on Problem 3463
5 12
1 2 2
1 3 2
1 4 2
2 3 1
3 2 1
2 4 1
4 2 1
3 4 1
4 3 1
2 5 3
3 5 3
4 5 3
1 5

答案是9

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