An O(n)-Time Algorithm for the Paired-Domination Problem on Permutation Graphs

A vertex subset D of a graph G is a dominating set if every vertex of G is either in D or is adjacent to a vertex in D. The paired-domination problem on G asks for a minimum-cardinality dominating set S of G such that the subgraph induced by S contains a perfect matching; motivation for this problem comes from the interest in finding a small number of locations to place pairs of mutually visible guards so that the entire set of guards monitors a given area. The paired-domination problem on general graphs is known to be NP-complete. In this paper, we consider the paired-domination problem on permutation graphs. We define an embedding of permutation graphs in the plane which enables us to obtain an equivalent version of the problem involving points in the plane, and we describe a sweeping algorithm for this problem; given the permutation over the set Nn = {1, 2, . . . , n} defining a permutation graph on n vertices, our algorithm computes a paired-dominating set of the graph in O(n) ...

• Type: Conference
• Year: 2009
• Where: IWOCA
• Authors: Evaggelos Lappas, Stavros D. Nikolopoulos, Leonidas Palios
• Keywords: Algorithms, Dominating Set, IWOCA 2009, Paired-domination Problem, Permutation Graph