Reprint of: Memory-constrained algorithms for simple polygons

  • Authors:
  • Tetsuo Asano;Kevin Buchin;Maike Buchin;Matias Korman;Wolfgang Mulzer;Günter Rote;André Schulz

  • Affiliations:
  • JAIST, Japan;TU Eindhoven, The Netherlands;TU Eindhoven, The Netherlands;UPC, Barcelona, Spain;Freie Universität Berlin, Germany;Freie Universität Berlin, Germany;WWU Münster, Germany

  • Venue:
  • Computational Geometry: Theory and Applications
  • Year:
  • 2014

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Abstract

A constant-work-space algorithm has read-only access to an input array and may use only O(1) additional words of O(logn) bits, where n is the input size. We show how to triangulate a plane straight-line graph with n vertices in O(n^2) time and constant work-space. We also consider the problem of preprocessing a simple polygon P for shortest path queries, where P is given by the ordered sequence of its n vertices. For this, we relax the space constraint to allow s words of work-space. After quadratic preprocessing, the shortest path between any two points inside P can be found in O(n^2/s) time.