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Re:有公式的吧，不过也可以用线段树的。

Posted by 350053879 at 2008-03-10 15:08:17 on Problem 3517
In Reply To: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 
用线段树怎么做。
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