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散列表使用某种算法操作(散列函数)将键转化为数组的索引来访问数组中的数据,这样可以通过Key-value的方式来访问数据,达到常数级别的存取效率。现在的nosql数据库都是采用key-value的方式来访问存储数据。 散列表是算法在时间和空间上做出权衡的经典例子。
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