Computing the Treewidth and the Minimum Fill-in with the Modular Decomposition

  • Authors:
  • Hans L. Bodlaender;Udi Rotics

  • Affiliations:
  • -;-

  • Venue:
  • SWAT '02 Proceedings of the 8th Scandinavian Workshop on Algorithm Theory
  • Year:
  • 2002

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Abstract

Using the notion of modular decomposition we extend the class of graphs on which both the treewidth and the minimum fill-in problems can be solved in polynomial time. We show that if C is a class of graphs which is modularly decomposable into graphs that have a polynomial number of minimal separators, or graphs formed by adding a matching between two cliques, then both the treewidth and the minimum fill-in problems on C can be solved in polynomial time. For the graphs that are modular decomposable into cycles we give algorithms, that use respectively O(n) and O(n3) time for treewidth and minimum fill-in.