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下限应该是O(n)，因为你输入数据就要这么多时间，nth element的期望也是O(b)

Posted by frkstyc at 2005-06-10 19:29:18 on Problem 2388
In Reply To:请教：这道题时间复杂度最低能降到多少？ Posted by:try19491001 at 2005-06-10 19:14:39 
> rt
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