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On the Weighted Quartet Consensus Problem

Authors Manuel Lafond, Celine Scornavacca

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Manuel Lafond
Celine Scornavacca

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Manuel Lafond and Celine Scornavacca. On the Weighted Quartet Consensus Problem. In 28th Annual Symposium on Combinatorial Pattern Matching (CPM 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 78, pp. 28:1-28:18, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2017)


In phylogenetics, the consensus problem consists in summarizing a set of phylogenetic trees that all classify the same set of species into a single tree. Several definitions of consensus exist in the literature; in this paper we focus on the Weighted Quartet Consensus problem, a problem with unknown complexity status so far. Here we prove that the Weighted Quartet Consensus problem is NP-hard and we give a 1/2-factor approximation for this problem. During the process, we propose a derandomization procedure of a previously known randomized 1/3-factor approximation. We also investigate the fixed-parameter tractability of this problem.
  • phylogenetic tree
  • consensus tree
  • quartets
  • complexity
  • fixed-parameter tractability


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