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2020 | OriginalPaper | Buchkapitel

Parameterized Algorithms for Directed Modular Width

verfasst von : Raphael Steiner, Sebastian Wiederrecht

Erschienen in: Algorithms and Discrete Applied Mathematics

Verlag: Springer International Publishing

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Abstract

Many well-known \(\mathsf {NP}\)-hard algorithmic problems on directed graphs resist efficient parameterizations with most known width measures for directed graphs, such as directed treewidth, DAG-width, Kelly-width and many others. While these focus on measuring how close a digraph is to an oriented tree resp. a directed acyclic graph, in this paper, we investigate directed modular width as a parameter, which is closer to the concept of clique-width. We investigate applications of modular decompositions of directed graphs to a wide range of algorithmic problems and derive FPT algorithms for several well-known digraph-specific \(\mathsf {NP}\)-hard problems, namely minimum (weight) directed feedback vertex set, minimum (weight) directed dominating set, digraph colouring, directed Hamiltonian path/cycle, partitioning into paths, (capacitated) vertex-disjoint directed paths, and the directed subgraph homeomorphism problem. The latter yields a polynomial-time algorithm for detecting topological minors in digraphs of bounded directed modular width. Finally we illustrate that other structural digraph parameters, such as directed pathwidth and cycle-rank can be computed efficiently using directed modular width as a parameter.

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Fußnoten
2
Reachability in directed graphs is a simple special case of the max-flow problem and can be solved using one of the well-known polynomial algorithms for this task (see for instance [12]).
 
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Metadaten
Titel
Parameterized Algorithms for Directed Modular Width
verfasst von
Raphael Steiner
Sebastian Wiederrecht
Copyright-Jahr
2020
DOI
https://doi.org/10.1007/978-3-030-39219-2_33