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混了……这个题从抽屉的角度去想ms比较容易明白，所以有O(n)的构造，假如是容斥，找什么集合来交交并并的呢？In Reply To:抽屉和容斥....没什么关系吧 Posted by:ArXoR at 2005-04-25 12:45:54 Followed by:
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