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郁闷了，USACO数据过了，在这还是WA了……

Posted by congming789 at 2009-10-03 10:38:41 on Problem 2187 
用了不知道叫什么的O(N)求最远点对的方法，枚举能过，说明凸包求的没问题，但官方数据也过了，还有什么WS的数据么？
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