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Re:逆序对怎么求？Re:I 线段处理

Posted by helloeveryone at 2004-09-13 22:53:07
In Reply To:Re:逆序对怎么求？Re:I 线段处理 Posted by:atlas_of_rruucc at 2004-09-13 18:25:41 
> 树状数组就很方便了

树状数组?
什么样子的呢?
能否举个例子?
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