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求蓄水池抽样算法 #65

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@wilbur-yu

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@wilbur-yu

给定一个数据流,数据流长度N很大,且N直到处理完所有数据之前都不可知,请问如何在只遍历一遍数据(O(N))的情况下,能够随机选取出m个不重复的数据。

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