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个人觉得这题出得不错。

Posted by AllwaysLoser at 2011-07-18 09:20:54 on Problem 3985 
至少它难倒了IOI2011中国队的一半同学。。。
给个提示吧：
时间复杂度为：
O(max(5000/k,(10*N*k))^2)，其中k是一个平衡因子，取10左右最好
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