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神题留名,第一次WA,然后原封不动再交一次,神奇的AC了。再交N次,没出现WA了。

Posted by bobo0906 at 2011-07-09 08:34:15 on Problem 2125
最后求完后,从源点一遍dfs,左边的点搜不到是割边,右边的点搜到,是割边。

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