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解题思路

Posted by raojun_06 at 2008-12-07 00:42:33 on Problem 1515
这道题用DFS就可以了,我没用严格的数学证明,凭直觉,但accept了,就是DFS每次遇到后向边时把这一圈上的路径都改为单向就行了

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