An O(n log n) algorithm for maximum st-flow in a directed planar graph

  • Authors:
  • Glencora Borradaile;Philip Klein

  • Affiliations:
  • Brown University, Providence, Rhode Island;Brown University, Providence, Rhode Island

  • Venue:
  • Journal of the ACM (JACM)
  • Year:
  • 2009

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Abstract

We give the first correct O(n log n) algorithm for finding a maximum st-flow in a directed planar graph. After a preprocessing step that consists in finding single-source shortest-path distances in the dual, the algorithm consists of repeatedly saturating the leftmost residual s-to-t path.