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U-Bubble Model for Mixed Unit Interval Graphs and Its Applications: The MaxCut Problem Revisited

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cris.lastimport.scopus2024-02-12T20:11:52Z
dc.abstract.enInterval graphs, intersection graphs of segments on a real line (intervals), play a key role in the study of algorithms and special structural properties. Unit interval graphs, their proper subclass, where each interval has a unit length, has also been extensively studied. We study mixed unit interval graphs—a generalization of unit interval graphs where each interval has still a unit length, but intervals of more than one type (open, closed, semi-closed) are allowed. This small modification captures a richer class of graphs. In particular, mixed unit interval graphs may contain a claw as an induced subgraph, as opposed to unit interval graphs. Heggernes, Meister, and Papadopoulos defined a representation of unit interval graphs called the bubble model which turned out to be useful in algorithm design. We extend this model to the class of mixed unit interval graphs and demonstrate the advantages of this generalized model by providing a subexponential-time algorithm for solving the MaxCut problem on mixed unit interval graphs. In addition, we derive a polynomial-time algorithm for certain subclasses of mixed unit interval graphs. We point out a substantial mistake in the proof of the polynomiality of the MaxCut problem on unit interval graphs by Boyacı et al. (Inf Process Lett 121:29–33, 2017. https://doi.org/10.1016/j.ipl.2017.01.007). Hence, the time complexity of this problem on unit interval graphs remains open. We further provide a better algorithmic upper-bound on the clique-width of mixed unit interval graphs.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorKratochvíl, Jan
dc.contributor.authorMasařík, Tomáš
dc.contributor.authorMasaříková, Jana
dc.date.accessioned2024-01-26T11:17:37Z
dc.date.available2024-01-26T11:17:37Z
dc.date.copyright2021-09-02
dc.date.issued2021
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.versionORIGINAL_AUTHOR
dc.identifier.doi10.1007/S00453-021-00837-4
dc.identifier.issn0178-4617
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/124029
dc.identifier.weblinkhttps://doi.org/10.1007/s00453-021-00837-4
dc.languageeng
dc.pbn.affiliationcomputer and information sciences
dc.relation.ispartofAlgorithmica
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleU-Bubble Model for Mixed Unit Interval Graphs and Its Applications: The MaxCut Problem Revisited
dc.typeJournalArticle
dspace.entity.typePublication