A faster algorithm for computing minimum 5-way and 6-way cuts in graphs

  • Authors:
  • Hiroshi Nagamochi;Shigeki Katayama;Toshihide Ibaraki

  • Affiliations:
  • Kyoto University, Kyoto, Japan;Kyoto University, Kyoto, Japan;Kyoto University, Kyoto, Japan

  • Venue:
  • COCOON'99 Proceedings of the 5th annual international conference on Computing and combinatorics
  • Year:
  • 1999

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Abstract

For an edge-weighted graph G with n vertices and m edges, the minimum k-way cut problem is to find a partition of the vertex set into k non-empty subsets so that the weight sum of edges between different subsets is minimized. For this problem with k = 5 and 6, we present a deterministic algorithm that runs in O(nk-2(nF(n;m) + C2(n, m) + n2)) = O(mnk log(n2/m)) time, where F(n, m) and C2(n, m) denote respectively the time bounds required to solve the maximum flow problem and the minimum 2-way cut problem in G. The bounds Õ(mn5) for k = 5 and Õ(mn6) for k = 6 improve the previous best randomized bounds Õ(n8) and Õ(n10), respectively.