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baiyunping333 (25)

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Joined January 2018 Active 8 years ago

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baiyunping333 (25)in #cn • 8 years ago
hash函数为什么要选择对素数求余
常用的hash函数是选一个数m取模（余数），这个数在课本中推荐m是素数，但是经常见到选择m=2^n，因为对2^n求余数更快，并认为在key分布均匀的情况下， key%m也是在[0,m-1]区间均匀分布的。但实际上，key%m的分布同m是有关的。证明如下： key%m = key -…
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