暴雪hash算法 - Stinky tofu - 博客园



暴雪hash算法 - Stinky tofu - 博客园

你有一个非常大的字符串数组A,现在又有一个字符串B,需要你去检测B是否存在于A中。最简单粗暴的方法是遍历整个A,但是这个方法投入到实际应用时的运行速度是难以接受的。在没有与其他所有字符串比较前怎么知道该字符串是否存在呢?

解决方法是使用哈希表,即用较小的数据类型来代表较大的数据类型,例如:用数字来代表字符串。你可以存储哈希值与字符串一一对应,当需要检测一个字符串时,就用哈希算法计算其哈希值,然后与存储的哈希值比较级可以得出结果,使用这一方法根据数组的大小和字符串长度提升速度大约100倍。


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