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Embracing the giant component

Flaxman, Abraham D. and Gamarnik, David and Sorkin, Gregory B. (2005) Embracing the giant component. Random Structures and Algorithms, 27 (3). pp. 277-289. ISSN 1042-9832

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Identification Number: 10.1002/rsa.20070

Abstract

Consider a game in which edges of a graph are provided a pair at a time, and the player selects one edge from each pair, attempting to construct a graph with a component as large as possible. This game is in the spirit of recent papers on avoiding a giant component, but here we embrace it. We analyze this game in the offline and online setting, for arbitrary and random instances, which provides for interesting comparisons. For arbitrary instances, we find that the competitive ratio (the best possible solution value divided by best possible online solution value) is large. For “sparse” random instances the competitive ratio is also large, with high probability (whp); If the instance has ¼(1 + ε)n random edge pairs, with 0 < ε ≤ 0.003, then any online algorithm generates a component of size O((log n)3/2) whp, while the optimal offline solution contains a component of size Ω(n) whp. For “dense” random instances, the average-case competitive ratio is much smaller. If the instance has ½(1 − ε)n random edge pairs, with 0 < ε ≤ 0.015, we give an online algorithm which finds a component of size Ω(n) whp.

Item Type: Article
Official URL: http://onlinelibrary.wiley.com/journal/10.1002/(IS...
Additional Information: © 2005 Wiley Periodicals, Inc.
Subjects: Q Science > QA Mathematics
Sets: Research centres and groups > Management Science Group
Departments > Management
Date Deposited: 13 Apr 2011 13:52
Last Modified: 06 Jun 2012 17:16
URI: http://eprints.lse.ac.uk/id/eprint/35468

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