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The Diagonal Poisson Transform and its application to the analysis of a hashing scheme

✍ Scribed by Patricio V. Poblete; Alfredo Viola; J. Ian Munro


Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
318 KB
Volume
10
Category
Article
ISSN
1042-9832

No coin nor oath required. For personal study only.

✦ Synopsis


We present an analysis of the effect of the last-come-first-served heuristic on a linear probing hash table. We study the behavior of successful searches, assuming searches for all elements of the table are equally likely. It is known that the Robin Hood heuristic achieves minimum variance over all linear probing algorithms. We show that the last-comefirst-served heuristic achieves this minimum up to lower-order terms. An accurate analysis of this algorithm is made by introducing a new transform which we call the Diagonal Poisson Transform as it resembles the Poisson Transform. We present important properties of this transform, as well as its application to solve some classes of recurrences, find inverse


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