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Online Maximum Directed Cut
2009 (English)In: ALGORITHMS AND COMPUTATION, PROCEEDINGS / [ed] Dong, Y; Du, DZ; Ibarra, O, 2009, 1124-1133 p.Conference paper (Refereed)
Abstract [en]

We investigate a natural online version of the well-known MAXIMUM DIRECTED CUT problem on DAGs. We propose a deterministic algorithm and show that it achieves a competitive ratio of 3 root 3/2 approximate to 2.5981. We then give a lower bound argument to show that no deterministic algorithm can achieve a ratio of 3 root 3/2 - epsilon for any epsilon > 0 thus showing that our algorithm is essentially optimal. Then, we extend our technique to improve upon the analysis of an old result: we show that greedily derandomizing the trivial randomized algorithm for MAXDICUT in general graphs improves the competitive ratio from 4 to 3, and also provide a tight example.

Place, publisher, year, edition, pages
2009. 1124-1133 p.
, Lecture Notes in Computer Science, ISSN 0302-9743 ; 5878
Keyword [en]
National Category
Computer and Information Science
URN: urn:nbn:se:kth:diva-58585DOI: 10.1007/978-3-642-10631-6_113ISI: 000280382600111ISBN: 978-3-642-10630-9OAI: diva2:473386
20th International Symposium on Algorithms and Computations
QC 20120117Available from: 2012-01-05 Created: 2012-01-05 Last updated: 2012-01-17Bibliographically approved

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Lampis, Michael
Computer and Information Science

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