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就是一直往左上方堆的那个。。

Posted by devilphoenix at 2006-06-14 15:16:07 on Problem 1020
In Reply To:问一下这道题的贪心怎么证明？ Posted by:devilphoenix at 2006-06-14 15:08:40 
> 晕晕的
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