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哦！ 想到了， 起始状态到目标状态应该是一个偶置换， 因为每一步移动是一个偶置换！ 所以只需要判断起始->目标这个置换的奇偶性就可以了，不用求逆序数 :> O（N）即可！In Reply To:这个题目怎么做 Posted by:hawk at 2003-11-13 16:34:03 > 哪有介绍？ Followed by:
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