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On the Algorithmic Effectiveness of Digraph Decompositions and Complexity Measures
City University, New York.
2008 (English)In: Algorithms And Computation, Proceedings, Springer Berlin/Heidelberg, 2008, 220-231 p.Conference paper (Refereed)
Abstract [en]

We place our focus on the gap between treewidth’s success in producing fixed-parameter polynomial algorithms for hard graph problems, and specifically Hamiltonian CircuitandMax Cut , and the failure of its directed variants (directed tree-width [9], DAG-width [11] and kelly-width [8]) to replicate it in the realm of digraphs.We answer the question of why this gap exists by giving two hardness results: we show that Directed Hamiltonian CircuitisW [2]-hard when the parameter is the width of the input graph, for any of these widths, and that Max Di Cut remains NP-hard even when restricted to DAGs, which have the minimum possible width under all these definitions. Our results also apply to directed pathwidth. (Eligible for best student paper)

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2008. 220-231 p.
, Lecture Notes in Computer Science, ISSN 0302-9743 ; 5369
Keyword [en]
Treewidth, Digraph decompositions, Parameterized Complexity
National Category
Computer and Information Science
URN: urn:nbn:se:kth:diva-58591DOI: 10.1007/978-3-540-92182-0_22ISI: 000264205500019ISBN: 978-3-540-92181-3OAI: diva2:473393
19th International Symposium on Algorithms and Computations (ISAAC 2008), Gold Coast, AUSTRALIA, DEC 15-17, 2008
QC 20120109Available from: 2012-01-05 Created: 2012-01-05 Last updated: 2012-01-09Bibliographically approved

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Lampis, Michael
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