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splay维护半凸壳之类的东西果然都很折翼啊……

Posted by xuhaoran510 at 2011-07-05 10:55:49 on Problem 3418 and last updated at 2011-07-05 10:58:49 
rt
另外这题pascal大显神威，status里第一版几乎都是pas的……不知有没有神犇知道这题pascal特别快的原因……
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