Discrete Mathematics & Theoretical Computer Science, Vol 14, No 1 (2012)

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A Branch-and-Reduce Algorithm for Finding a Minimum Independent Dominating Set

Serge Gaspers, Mathieu Liedloff


An independent dominating set D of a graph G = (V, E) is a subset of vertices such that every vertex in V \ D has at least one neighbor in D and D is an independent set, i.e. no two vertices of D are adjacent in G. Finding a minimum independent dominating set in a graph is an NP-hard problem. Whereas it is hard to cope with this problem using parameterized and approximation algorithms, there is a simple exact O(1.4423^n)-time algorithm solving the problem by enumerating all maximal independent sets. In this paper we improve the latter result, providing the first non trivial algorithm computing a minimum independent dominating set of a graph in time O(1.3569^n). Furthermore, we give a lower bound of Ω(1.3247^n) on the worst-case running time of this algorithm, showing that the running time analysis is almost tight.

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