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Journal of Algorithms
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A fast and simple randomized parallel algorithm for the maximal independent set problem

Authors: Noga Alon; László Babai; Alon Itai;

A fast and simple randomized parallel algorithm for the maximal independent set problem

Abstract

Summary: A simple parallel randomized algorithm to find a maximal independent set in a graph \(G = (V, E)\) on \(n\) vertices is presented. Its expected running time on a concurrent-read concurrent-write PRAM with \(O(|E|d_{\max})\) processors is \(O(\log n)\), where \(d_{\max}\) denotes the maximum degree. On an exclusive-read exclusive-write PRAM with \(O(|E|)\) processors the algorithm runs in \(O(\log^2n)\). Previously, an \(O(\log^4n)\) deterministic algorithm was given by \textit{R. M. Karp} and \textit{A. Wigderson} [Proc. 16th Ann. ACM Symp. Theory of Computing, STOC 1984, 266--272 (1984); see also J. Assoc. Comput. Mach. 32, 762--773 (1985; Zbl 0633.68026)] for the EREW-PRAM model. This was recently (independently of our work) improved to \(O(\log^2n)\) by \textit{M. Luby} [Proc. 17th ACM Symp. Theory of Computing, STOC 1985, 1--10 (1985); see also SIAM J. Comput. 15, 1036--1053 (1986; Zbl 0619.68058)]. In both cases randomized algorithms depending on pairwise independent choices were turned into deterministic algorithms. We comment on how randomized combinatorial algorithms whose analysis only depends on \(d\)-wise rather than fully independent random choices (for some constant \(d)\) can be converted into deterministic algorithms. We apply a technique due to \textit{A. Joffe} [Ann. Probab. 2, 161--162 (1974; Zbl 0276.60005)] and obtain deterministic construction in fast parallel time of various combinatorial objects whose existence follows from probabilistic arguments.

Keywords

expected running time, Analysis of algorithms and problem complexity, Randomized algorithms, concurrent-read concurrent-write PRAM, exclusive- read exclusive-write PRAM, Vertex subsets with special properties (dominating sets, independent sets, cliques, etc.), Graph theory (including graph drawing) in computer science, Graph algorithms (graph-theoretic aspects), parallel randomized algorithm, Parallel algorithms in computer science, maximal independent set in a graph

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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!
491
Top 1%
Top 0.1%
Top 10%
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