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其实仔细也能在第三个例子看出来

Posted by crackerwang at 2007-06-04 19:56:01 on Problem 2961
In Reply To:不知道这种问题在正规比赛中是否会有人解答。如果没有的话就会很惨。。。除非题目说清楚了。。。。 Posted by:sza at 2006-08-14 00:59:29
但是一般的直觉都是让人想到的是x是行

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