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怎么老是wa

Posted by SherlockBourne at 2007-11-18 22:41:06 on Problem 1947
我写了个n^4的树形dp。。。本来以为是tle的。。。谁知一直在wa。。。
这题有什么bt的地方要特别注意么?哪位大牛讲讲正确的算法是啥?

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