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WA的试试这几组数据...

Posted by lcqbest at 2009-07-17 19:49:26 on Problem 1679
4

4 3
1 2 4
2 3 0
3 4 4

1 0

3 3
1 2 1
2 3 2
3 1 3

4 4
1 2 2
2 3 2
3 4 2
4 1 2

2 0

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