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请问下如何判断一个给定的序列是否solvable呢

Posted by yogafrank at 2008-09-06 10:42:20 on Problem 1077
In Reply To:第一个A* Posted by:mylamb at 2008-09-05 12:34:07
如题!
好像是和逆序数有关是吧?

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