Moderate 查单词 @CareerCup - - 博客频道 - CSDN.NET



Moderate 查单词 @CareerCup - - 博客频道 - CSDN.NET

简单题，如果是只查询一次，则用时O(n)

如果要多次查询，则用一个Hashtable存储已查过的词


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