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Re:自己推了一个公式 :)

Posted by lb1988 at 2009-08-25 14:56:57 on Problem 1012
In Reply To:自己推了一个公式 :) Posted by:888899977 at 2007-10-12 17:25:56
....  这也算自己推了一个公式呀  你这是直接用递推做的....

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