Shortest non-trivial cycles in directed surface graphs

  • Authors:
  • Jeff Erickson

  • Affiliations:
  • University of Illinois, Urbana-Champaign, Urbana, IL, USA

  • Venue:
  • Proceedings of the twenty-seventh annual symposium on Computational geometry
  • Year:
  • 2011

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Abstract

Let G be a directed graph embedded on a surface of genus g. We describe an algorithm to compute the shortest non-separating cycle in G in O(g2 n log n) time, exactly matching the fastest algorithm known for undirected graphs. We also describe an algorithm to compute the shortest non-contractible cycle in G in gO(g)n log n time, matching the fastest algorithm for undirected graphs of constant genus.