Some NP-complete geometric problems

  • Authors:
  • M. R. Garey;R. L. Graham;D. S. Johnson

  • Affiliations:
  • -;-;-

  • Venue:
  • STOC '76 Proceedings of the eighth annual ACM symposium on Theory of computing
  • Year:
  • 1976

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Abstract

We show that the STEINER TREE problem and TRAVELING SALESMAN problem for points in the plane are NP-complete when distances are measured either by the rectilinear (Manhattan) metric or by a natural discretized version of the Euclidean metric. Our proofs also indicate that the problems are NP-hard if the distance measure is the (unmodified) Euclidean metric. However, for reasons we discuss, there is some question as to whether these problems, or even the well-solved MINIMUM SPANNING TREE problem, are in NP when the distance measure is the Euclidean metric.