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北京大学《ACM/ICPC大学生程序设计竞赛训练》暑期课面向全球招生!

在某个论坛看到有人提供的一个待验证的算法,刚试了一下,是正确的,方法如下

Posted by czcomt at 2008-12-25 18:34:14 on Problem 2631
先任一个点(A)DFS,找到最长的终点(B),再从(B)开始DFS找最长,第二次DFS的结果就是答案了,不明白的mail我吧

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