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Re:一定要注意这两种情况

Posted by jhb at 2011-09-18 15:25:44 on Problem 1189
In Reply To:一定要注意这两种情况 Posted by:00648057 at 2011-03-25 20:31:46
题目看清楚
题目中有'假定最下面一排钉子不会被拔掉'这句话……

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