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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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