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Algorithms for clique-independent sets on subclasses of circular-arc graphs |
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| Authors: | Guillermo Durán Min Chih Lin Sergio Mera Jayme Luiz Szwarcfiter |
| Institution: | a Departamento de Ingeniería Industrial, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile b Departamento de Computación, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina c Instituto de Matemática, NCE and COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil |
| Abstract: | A circular-arc graph is the intersection graph of arcs on a circle. A Helly circular-arc graph is a circular-arc graph admitting a model whose arcs satisfy the Helly property. A clique-independent set of a graph is a set of pairwise disjoint cliques of the graph. It is NP-hard to compute the maximum cardinality of a clique-independent set for a general graph. In the present paper, we propose polynomial time algorithms for finding the maximum cardinality and weight of a clique-independent set of a  -free CA graph. Also, we apply the algorithms to the special case of an HCA graph. The complexity of the proposed algorithm for the cardinality problem in HCA graphs is O(n). This represents an improvement over the existing algorithm by Guruswami and Pandu Rangan, whose complexity is O(n2). These algorithms suppose that an HCA model of the graph is given. |
| Keywords: | Algorithms Circular-arc graphs Clique-independent sets Helly circular-arc graphs |
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