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别误导人了,这就是森林

Posted by TrueBamboo at 2012-09-13 23:52:42 on Problem 1770
那些会死循环的,看看是不是树状DP写错了。至于DAG是不可能出现的,因为题目一个条件的隐含意思就是任意两个能量之间只有一条路径,因此就是一个森林。

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