8.1 Introduction and Recap 18.2 Number of Distinct Elements
نویسنده
چکیده
Let us review the fundamental framework of streaming. Suppose we have a stream coming in from time 0 to time T . At each time t ∈ [T ], the coming element is at ∈ [n]. Frequency for any element i is defined as mi = |{j|aj = i}|. We will see a few problems to solve under this framework. For different problems, we expect to have a complexity of only O(log n) and O(log T ) on either storage or update time. We should only make a few passes over the stream under these strong constraints.
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