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公式也不难吧

Posted by frkstyc at 2005-09-11 11:34:26 on Problem 2601
In Reply To:Re:这题怎么做？公式怎么推呢？还是用二分？ Posted by:OurUSTC at 2005-09-11 11:33:27 
> 
> 二分，：）
> 懒人不推公式阿
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