Point containment in the integer hull of a polyhedron

  • Authors:
  • Ernst Althaus;Friedrich Eisenbrand;Stefan Funke;Kurt Mehlhorn

  • Affiliations:
  • Max-Planck-Institute for Computer Science, Saarbrücken, Germany;Max-Planck-Institute for Computer Science, Saarbrücken, Germany;Max-Planck-Institute for Computer Science, Saarbrücken, Germany;Max-Planck-Institute for Computer Science, Saarbrücken, Germany

  • Venue:
  • SODA '04 Proceedings of the fifteenth annual ACM-SIAM symposium on Discrete algorithms
  • Year:
  • 2004

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Abstract

We show that the point containment problem in the integer hull of a polyhedron, which is defined by m inequalities, with coefficients of at most &phis; bits can be solved in time O(m + &phis;) in the two-dimensional case and in expected time O(m + &phis;2 log m) in any fixed dimension. This improves on the algorithm which is based on the equivalence of separation and optimization in the general case and on a direct algorithm (SODA 97) for the two-dimensional case.