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顶

Posted by Seen at 2011-04-23 14:05:58 on Problem 3270 and last updated at 2011-04-23 14:40:59
In Reply To:置换环 最优解有两种情况 一是用每个环内的局部最不牛逼牛与其它牛换 二是引进外牛,用全局最不牛逼牛与环内每一个换 Posted by:xuchang at 2011-01-11 14:20:45 
LS一语道破这题实质，让偶茅塞顿开。
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