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你们说的水题是不是指的是这个题目是赤裸裸的背包阿，我还没有想明白阿，阿阿阿阿阿阿阿阿阿阿阿，一定要搞定哦

Posted by denganliang at 2011-03-31 14:10:56 on Problem 3627 
用这个水题战胜背包类型的题目
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