Improved parameterized and exact algorithms for cut problems on trees

We study the Multicut on Trees and the Generalized Multiway Cut on Trees problems. For the Multicut on Trees problem, we present a parameterized algorithm that runs in time O⁎(ρk), where ρ=2+1<1.554 is the positive root of the polynomial x4−2x2−1. This improves the current-best algorithm of Chen...

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Vydáno v:Theoretical computer science Ročník 607; s. 455 - 470
Hlavní autoři: Kanj, Iyad, Lin, Guohui, Liu, Tian, Tong, Weitian, Xia, Ge, Xu, Jinhui, Yang, Boting, Zhang, Fenghui, Zhang, Peng, Zhu, Binhai
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier B.V 01.11.2015
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ISSN:0304-3975, 1879-2294
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Abstract We study the Multicut on Trees and the Generalized Multiway Cut on Trees problems. For the Multicut on Trees problem, we present a parameterized algorithm that runs in time O⁎(ρk), where ρ=2+1<1.554 is the positive root of the polynomial x4−2x2−1. This improves the current-best algorithm of Chen et al. that runs in time O⁎(1.619k). For the Generalized Multiway Cut on Trees problem, we show that this problem is solvable in polynomial time if the number of terminal sets is fixed; this answers an open question posed in a recent paper by Liu and Zhang. By reducing the Generalized Multiway Cut on Trees problem to the Multicut on Trees problem, our results give a parameterized algorithm that solves the Generalized Multiway Cut on Trees problem in time O⁎(ρk).
AbstractList We study the Multicut on Trees and the Generalized Multiway Cut on Trees problems. For the Multicut on Trees problem, we present a parameterized algorithm that runs in time , where is the positive root of the polynomial . This improves the current-best algorithm of Chen et al. that runs in time . For the Generalized Multiway Cut on Trees problem, we show that this problem is solvable in polynomial time if the number of terminal sets is fixed; this answers an open question posed in a recent paper by Liu and Zhang. By reducing the Generalized Multiway Cut on Trees problem to the Multicut on Trees problem, our results give a parameterized algorithm that solves the Generalized Multiway Cut on Trees problem in time .
We study the Multicut on Trees and the Generalized Multiway Cut on Trees problems. For the Multicut on Trees problem, we present a parameterized algorithm that runs in time O⁎(ρk), where ρ=2+1<1.554 is the positive root of the polynomial x4−2x2−1. This improves the current-best algorithm of Chen et al. that runs in time O⁎(1.619k). For the Generalized Multiway Cut on Trees problem, we show that this problem is solvable in polynomial time if the number of terminal sets is fixed; this answers an open question posed in a recent paper by Liu and Zhang. By reducing the Generalized Multiway Cut on Trees problem to the Multicut on Trees problem, our results give a parameterized algorithm that solves the Generalized Multiway Cut on Trees problem in time O⁎(ρk).
Author Tong, Weitian
Zhang, Peng
Lin, Guohui
Kanj, Iyad
Liu, Tian
Xu, Jinhui
Zhang, Fenghui
Zhu, Binhai
Xia, Ge
Yang, Boting
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  organization: Department of Computer Science, Montana State University, Bozeman, MT 59717, USA
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Keywords Tree
Multiway cut
Multicut
Parameterized algorithm
Exact algorithm
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Snippet We study the Multicut on Trees and the Generalized Multiway Cut on Trees problems. For the Multicut on Trees problem, we present a parameterized algorithm that...
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SubjectTerms Algorithms
Exact algorithm
Multicut
Multiway cut
Parameterized algorithm
Polynomials
Roots
Terminals
Tree
Trees
Title Improved parameterized and exact algorithms for cut problems on trees
URI https://dx.doi.org/10.1016/j.tcs.2015.06.010
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