A new approach to all pairs shortest paths in planar graphs

  • Authors:
  • G. N. Frederickson

  • Affiliations:
  • Department of Computer Sciences, Purdue University

  • Venue:
  • STOC '87 Proceedings of the nineteenth annual ACM symposium on Theory of computing
  • Year:
  • 1987

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Abstract

An algorithm is presented for generating a succinct encoding of all pairs shortest path information in a directed planar graph G with real-valued edge costs but no negative cycles. The algorithm runs in &Ogr;(pn) time, where n is the number of vertices in G, and p is the minimum cardinality of a subset of the faces that cover all vertices, taken over all planar embeddings of G. Linear-time algorithms are presented for various subproblems including that of finding an appropriate embedding of G and a corresponding face-on-vertex covering of cardinality &Ogr;(p), and of generating all pairs shortest path information in a directed outerplanar graph.