Certifying algorithms for recognizing proper circular-arc graphs and unit circular-arc graphs

  • Authors:
  • Haim Kaplan;Yahav Nussbaum

  • Affiliations:
  • The Blavatnik School of Computer Science, Tel Aviv University, Tel Aviv 69978, Israel;The Blavatnik School of Computer Science, Tel Aviv University, Tel Aviv 69978, Israel

  • Venue:
  • Discrete Applied Mathematics
  • Year:
  • 2009

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Abstract

We give two new linear-time algorithms, one for recognizing proper circular-arc graphs and the other for recognizing unit circular-arc graphs. Both algorithms provide either a model for the input graph, or a certificate that proves that such a model does not exist and can be authenticated in O(n) time. No other previous algorithm for each of these two graph classes provides a certificate for its result.