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只要图里面不含割点就不会有桥，所以只要判断是否有割点就好了

Posted by yu_ at 2009-01-04 14:24:29 on Problem 3713
In Reply To:我靠，终于过了。我来回答吧 Posted by:20053565 at 2009-01-03 11:10:05 
> 我的做法是枚举删除一个点，然后看剩下的图里有没有割点和桥，有的话就不行
> 之前求割点和桥各dfs了一次 于是超时了 其实dfs一次 求出pre数组和low数组就行了
> 我不知道这么做对不对 只是直觉 所以就试了试 要是找到反例了告诉我
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