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p>0时，点的密度是有常数上限的，但是全相同的时候p==0就会有O(n)个。。。所以退化，不过是可以规范地避免的

Posted by ArXoR at 2006-12-25 12:47:20
In Reply To:faint。这个结论貌似是错的 Posted by:wywcgs at 2006-12-25 12:25:27 
> -_-!!!
> 看来这道题的数据弱得可以，随随便便就能混到最后一组case……
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