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树型DP还是很有意思的,但是大家千万注意

Posted by smallbox at 2009-05-15 21:05:38 on Problem 1947 
可以是不包含根节点的子树,只要是分离开来而且满足节点数条件.
Anyway,树型DP绝对是最容易wa掉的DP.
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