Finding Matching Cuts in H-Free Graphs

Authors Felicia Lucke , Daniël Paulusma , Bernard Ries

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Felicia Lucke
  • Department of Informatics, University of Fribourg, Switzerland
Daniël Paulusma
  • Department of Computer Science, Durham University, UK
Bernard Ries
  • Department of Informatics, University of Fribourg, Switzerland

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Felicia Lucke, Daniël Paulusma, and Bernard Ries. Finding Matching Cuts in H-Free Graphs. In 33rd International Symposium on Algorithms and Computation (ISAAC 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 248, pp. 22:1-22:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)


The well-known NP-complete problem Matching Cut is to decide if a graph has a matching that is also an edge cut of the graph. We prove new complexity results for Matching Cut restricted to H-free graphs, that is, graphs that do not contain some fixed graph H as an induced subgraph. We also prove new complexity results for two recently studied variants of Matching Cut, on H-free graphs. The first variant requires that the matching cut must be extendable to a perfect matching of the graph. The second variant requires the matching cut to be a perfect matching. In particular, we prove that there exists a small constant r > 0 such that the first variant is NP-complete for P_r-free graphs. This addresses a question of Bouquet and Picouleau (arXiv, 2020). For all three problems, we give state-of-the-art summaries of their computational complexity for H-free graphs.

Subject Classification

ACM Subject Classification
  • Mathematics of computing → Graph algorithms
  • matching cut
  • perfect matching
  • H-free graph
  • computational complexity


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