Optimal Non-Adaptive Cell Probe Dictionaries and Hashing

08/30/2023

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by   Kasper Green Larsen, et al.

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We present a simple and provably optimal non-adaptive cell probe data structure for the static dictionary problem. Our data structure supports storing a set of n key-value pairs from [u]× [u] using s words of space and answering key lookup queries in t = O((u/n)/(s/n)) non-adaptive probes. This generalizes a solution to the membership problem (i.e., where no values are associated with keys) due to Buhrman et al. and matches a recent lower bound by Persiano and Yeo. Using the ideas underlying our data structure, we also obtain the first implementation of a n-wise independent family of hash functions with optimal evaluation time in the cell probe model.