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iOS重做轮子，写一个NSDictionary（二）
source link: http://www.cocoachina.com/ios/20180814/24555.html
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树结构是一种很常见的数据结构，比如我们的文件目录，数据库的索引，以及我们现在将要讲述的字典。在第一篇文章中，我们用hashtable实现了一个字典，这种结构的字典也是 apple NSDictionary 或 CFDictionary 所采用的方案。
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