An improved algorithm for Klee's measure problem on fat boxes

  • Authors:
  • Karl Bringmann

  • Affiliations:
  • Max-Planck-Institut für Informatik, 66123 Saarbrücken, Germany

  • Venue:
  • Computational Geometry: Theory and Applications
  • Year:
  • 2012

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Abstract

The measure problem of Klee asks for the volume of the union of n axis-parallel boxes in a fixed dimension d. We give an O(n^(^d^+^2^)^/^3) time algorithm for the special case of all boxes being cubes or, more generally, fat boxes. Previously, the fastest run-time was n^d^/^22^O^(^l^o^g^^^@?^n^), achieved by the general case algorithm of Chan [SoCG 2008]. For the general problem our run-time would imply a breakthrough for the k-clique problem.