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汗，做了这么久！公布这个题目对于新手注意的地方

Posted by R2D2 at 2008-02-29 13:27:20 on Problem 3140 and last updated at 2008-02-29 14:10:15 
这个题目做得很郁闷，TLE＋WA了不少次数，公布自己的错误（通过看discuss整理）

注意数据大小不能为int，这样会wa

建树时得到的邻接链表在用完后不要一个一个去delete，这样会TLE

对于N＝1的情况，可以认为还有一组0个

据说这个题目是树形DP，我用DFS水过去的～～
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