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抽屉原理？怎么构造抽屉呀，能说得更详细一点 吗？thxIn Reply To: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？ Posted by:frkstyc at 2005-04-25 12:48:44 Followed by:
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