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Approximating k-Edge-Connected Spanning Subgraphs via a Near-Linear Time LP Solver
KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Theoretical Computer Science, TCS. University of Copenhagen, Denmark.ORCID iD: 0000-0003-4468-2675
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2022 (English)In: 49th International Colloquium on Automata, Languages, and Programming (ICALP 2022), Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing , 2022, Vol. 229, article id 37Conference paper, Published paper (Refereed)
Abstract [en]

In the k-edge-connected spanning subgraph (kECSS) problem, our goal is to compute a minimum-cost sub-network that is resilient against up to k link failures: Given an n-node m-edge graph with a cost function on the edges, our goal is to compute a minimum-cost k-edge-connected spanning subgraph. This NP-hard problem generalizes the minimum spanning tree problem and is the “uniform case” of a much broader class of survival network design problems (SNDP). A factor of two has remained the best approximation ratio for polynomial-time algorithms for the whole class of SNDP, even for a special case of 2ECSS. The fastest 2-approximation algorithm is however rather slow, taking O(mnk) time [Khuller, Vishkin, STOC'92]. A faster time complexity of O(n2) can be obtained, but with a higher approximation guarantee of (2k − 1) [Gabow, Goemans, Williamson, IPCO'93]. Our main contribution is an algorithm that (1 + ε)-approximates the optimal fractional solution in Õ(m/ε2) time (independent of k), which can be turned into a (2 + ε) approximation algorithm that runs in time (Equation presented) for (integral) kECSS; this improves the running time of the aforementioned results while keeping the approximation ratio arbitrarily close to a factor of two.

Place, publisher, year, edition, pages
Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing , 2022. Vol. 229, article id 37
Series
Leibniz International Proceedings in Informatics, LIPIcs, ISSN 1868-8969 ; 229
Keywords [en]
Approximation Algorithms, Data Structures
National Category
Computer Sciences
Identifiers
URN: urn:nbn:se:kth:diva-317539DOI: 10.4230/LIPIcs.ICALP.2022.37Scopus ID: 2-s2.0-85133440936OAI: oai:DiVA.org:kth-317539DiVA, id: diva2:1695301
Conference
49th EATCS International Conference on Automata, Languages, and Programming, ICALP 2022, 4 July 2022 through 8 July 2022, Paris, France
Note

QC 20220913

Part of proceedings: ISBN 978-395977235-8

Available from: 2022-09-13 Created: 2022-09-13 Last updated: 2022-09-13Bibliographically approved

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Na Nongkai, Danupon

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