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用简单易写的三分单谷的思想AC了这题(O(NlogN)),有兴趣的可以来我的blog看看

Posted by intheway at 2009-10-02 17:06:51 on Problem 2187 
http://hi.baidu.com/it_intheway/blog/item/c879f2c39cadb23fe4dd3b60.html
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