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Predecessor Queries in Constant Time?

Authors: Marek Karpinski; Yakov Nekrich;

Predecessor Queries in Constant Time?

Abstract

In this paper we design a new static data structure for batched predecessor queries. In particular, our data structure supports $O(\sqrt{{\rm log}n})$ queries in O(1) time per query and requires $O(n^{\epsilon\sqrt{{\rm log}n}})$ space for any e > 0. This is the first o(N) space and O(1) amortized time data structure for arbitrary $N = \Omega(n^{\epsilon\sqrt{{\rm log}n}})$ where N is the size of the universe. We also present a data structure that answers O(log log N) predecessor queries in O(1) time per query and requires $O(n^{\epsilon{\rm log log} {\it N}})$ space for any e > 0. The method of solution relies on a certain way of searching for predecessors of all elements of the query in parallel. In a general case, our approach leads to a data structure that supports p(n) queries in $O(\sqrt{{\rm log} n}/p(n))$ time per query and requires O(n$^{p({\it n})}$) space for any $p(n) =O(\sqrt{{\rm log}n})$, and a data structure that supports p(N) queries in O(log log N/p(N)) time per query and requires O(n$^{p({\it N})}$) space for any p(N)=O(log log N).

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
2
Average
Average
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