Treffer: Improved algorithms and complexity results for power domination in graphs
Wilhelm-Schickard-Institut für Informatik, Universität Tiibingen, Sand 13, 72076 Tübingen, Germany
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The POWER DOMINATING SET problem is a variant of the classical domination problem in graphs: Given an undirected graph G = (V, E), find a minimum P C V such that all vertices in V are observed by 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. 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 cannot be better approximated than DOMINATING SET.