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有公式的吧，不过也可以用线段树的。

Posted by Thank_you at 2008-03-10 14:35:24 on Problem 3517
In Reply To:这题应该怎么做？谁可以提示一下。注意是提示 Posted by:toontong at 2008-03-09 14:46:27 
> 注意是提示
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