A (2 - c1/√N)-approximation algorithm for the stable marriage problem

  • Authors:
  • Kazuo Iwama;Shuichi Miyazaki;Naoya Yamauchi

  • Affiliations:
  • Graduate School of Informatics, Kyoto University;Academic Center for Computing and Media Studies, Kyoto University;Graduate School of Informatics, Kyoto University

  • Venue:
  • ISAAC'05 Proceedings of the 16th international conference on Algorithms and Computation
  • Year:
  • 2005

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Abstract

We consider the problem of finding a stable matching of maximum size when both ties and unacceptable partners are allowed in preference lists. This problem is NP-hard and the current best known approximation algorithm achieves the approximation ratio $2 - c{{\rm log N} \over {N}}$, where c is an arbitrary positive constant and N is the number of men in an input. In this paper, we improve the ratio to $2 - c{{1} \over {\sqrt{N}}}$, where c is a constant such that $c \leq {{1}\over{4\sqrt{6}}}$.