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这道题很多AC的程序其实都是错的!看看这两组数据

Posted by Vidic15 at 2009-11-17 13:51:52 on Problem 3169
3 2 1
1 2 5
1 3 10
2 3 20
这个数据应该输出 -1
4 2 1
1 3 10
2 4 10
2 4 2
这个数据应该输出 -2

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