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我是这么做的：（见下） 想请教dynamic简略讲讲这题是怎么利用到置换群的， 虽然经典但是我还是没有听说过:p

Posted by rruucc at 2003-11-13 19:33:23 on Problem 1507
In Reply To:这个题目怎么做 Posted by:hawk at 2003-11-13 16:34:03 
> 哪有介绍？
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