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dp呀。。

Posted by 20053565 at 2008-09-06 14:50:17 on Problem 3688
In Reply To:大伙给点提示好吗?本人不才,只想到了2^n的"算法".-____________- Posted by:timeloop at 2008-09-06 14:45:35 
> 到底怎么才是在线性时间内做出判断啊?难道是数论的东西?
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