Algorithms with large domination ratio

  • Authors:
  • Noga Alon;Gregory Gutin;Michael Krivelevich

  • Affiliations:
  • Institute for Advanced Study, Princeton, NJ and Department of Mathematics, Tel Aviv University, Tel Aviv 69978, Israel;Department of Computer Science, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK;Department of Mathematics, Tel Aviv University, Tel Aviv 69978, Israel

  • Venue:
  • Journal of Algorithms
  • Year:
  • 2004

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Abstract

Let P be an optimization problem, and let A be an approximation algorithm for P. The domination ratio domr(A, n) is the maximum real q such that the solution x(I) obtained by A for any instance I of P of size n is not worse than at least a fraction q of the feasible solutions of I. We describe a deterministic, polynomial-time algorithm with domination ratio 1 - o(1) for the partition problem, and a deterministic, polynomial-time algoritiun with domination ratio Ω(1) for the MaxCut problem and for some far-reaching extensions of it, including Max-r-Sat, for each fixed r. The techniques combine combinatorial and probabilistic methods with tools from harmonic analysis.