Algorithmica

, Volume 52, Issue 2, pp 177–202 | Cite as

Improved Algorithms and Complexity Results for Power Domination in Graphs

Article

Abstract

The NP-complete Power Dominating Set problem is an “electric power networks variant” of the classical domination problem in graphs: Given an undirected graph G=(V,E), find a minimum-size set PV such that all vertices in V are “observed” by the vertices in P. Herein, a vertex observes itself and all its neighbors, and if an observed vertex has all but one of its neighbors observed, then the remaining neighbor becomes observed as well. We show that Power Dominating Set can be solved by “bounded-treewidth dynamic programs.” For treewidth being upper-bounded by a constant, we achieve a linear-time algorithm. In particular, we present a simplified linear-time algorithm for Power Dominating Set in trees. Moreover, we simplify and extend several NP-completeness results, particularly showing that Power Dominating Set remains NP-complete for planar graphs, for circle graphs, and for split graphs. Specifically, our improved reductions imply that Power Dominating Set parameterized by |P| is W[2]-hard and it cannot be better approximated than Dominating Set.

Keywords

Design and analysis of algorithms Computational complexity Parameterized complexity Fixed-parameter algorithms Graph algorithms Graphs of bounded treewidth (Power) domination in graphs 

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© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Institut für InformatikFriedrich-Schiller-Universität JenaJenaGermany
  2. 2.Abteilung Informatik/Wirtschaftsinformatik, Fachbereich IVUniversität TrierTrierGermany

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