Two arc disjoint paths in Eulerian digraphs

  • András Frank
  • Toshihide Ibaraki
  • Hiroshi Nagamochi
Session 3B
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1004)


Let G be an Eulerian digraph, and {x1, x2}, {y1, y2} be two pairs of vertices in G. An instance (G; {x1, x2}, {y1, y2}) is called feasible if it contains two arc-disjoint x′x″- and y′y″- paths, where {x′, x″}= {x1, x2} and {y′, y″}={y1, y2}. An O(m+nlog n) time algorithm is presented to decide whether G is feasible, where n and m are the number of vertices and arcs in G, respectively. The algorithm is based on a structural characterization of minimal infeasible instances.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • András Frank
    • 1
  • Toshihide Ibaraki
    • 2
  • Hiroshi Nagamochi
    • 2
  1. 1.Dept. of Computer Science, Mathematical InstituteEötvös UniversityBudapest VIIIHungary
  2. 2.Dept. of Applied Mathematics and PhysicsKyoto UniversityKyotoJapan

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