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终于ac了这题,搞了半天,真是弱啊:(

Posted by gz2001 at 2004-07-18 18:04:58 on Problem 1701
不知道有人是不是用O(n^2)的算法过的,我不敢用
开始想了一个二分,wa了
然后发现可以在O(n)时间作出来,开始用int存,还是wa
wa了3次才改成double类型,这才AC

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