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Re:请提示一下思路！实在想不出来怎么做

Posted by ssc at 2005-03-30 18:00:07 on Problem 1405
In Reply To:Re:请提示一下思路！实在想不出来怎么做 Posted by:kicc at 2003-10-17 22:41:18 
虽然很直观，但不知如何证明这是最优解？
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