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这题险过，2500MS，汗啊~ 看来压精度的算法（我用的二分）都不是很可靠呢

Posted by abilitytao at 2009-09-04 22:57:01 on Problem 2728 and last updated at 2009-09-04 23:06:33 
比赛的时候，真的敢用这样的算法吗？
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