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谁能讲一下那个优化啊。。。关于图重心的。。。

Posted by xxiioo3 at 2011-08-14 20:57:08 on Problem 1987 
谁先说一下 这个题 是dfs几次 n次 还是1次

我现在写的是一次的。。。但是 问题是 如果图的根是重心 那么不一定和当前根连通啊 0 0

难道是dfsn次么。。。
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