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请教大家对这题的解法

Posted by c0500446123 at 2005-05-29 21:28:09 on Problem 2438
这题成为今天的第二简单题,实在太弱了
1.请教大家用什么方法做出来的?(应该都是搜吧?)
2.如果把n扩大到1000甚至2000,有更好的方法吗?

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