Improved approximation guarantees for weighted matching in the semi-streaming model

Leah Epstein, Asaf Levin, Julián Mestre, Danny Segev

Research output: Contribution to journalArticlepeer-review


We study the maximum weight matching problem in the semi-streaming model, and improve on the currently best one-pass algorithm due to Zelke [Proceedings of the 25th Annual Symposium on Theoretical Aspects of Computer Science, 2008, pp. 669-680] by devising a deterministic approach whose performance guarantee is 4.91 + ε. In addition, we study preemptive online algorithms, a class of algorithms related to one-pass semi-streaming algorithms, where we are allowed to maintain only a feasible matching in memory at any point in time. We provide a lower bound of 4.967 on the competitive ratio of any such deterministic algorithm, and hence show that future improvements will have to store in memory a set of edges that is not necessarily a feasible matching. We conclude by presenting an empirical study, conducted in order to compare the practical performance of our approach to that of previously suggested algorithms.

Original languageEnglish
Pages (from-to)1251-1265
Number of pages15
JournalSIAM Journal on Discrete Mathematics
Issue number3
StatePublished - 2011


  • Approximation algorithms
  • Competitive analysis
  • Semi-streaming
  • Weighted matching

ASJC Scopus subject areas

  • General Mathematics


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