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这题找桥再缩点的方法貌似有问题

Posted by wx5391805 at 2012-07-01 16:08:37 on Problem 3352
假如一个图没有桥但有割点,那么它也不是双连通的
比如
5 6
1 2
1 3
2 3
3 4
4 5
5 3
标程就是0了。

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