Partition trees for triangle counting and other range searching problems

  • Authors:
  • E. Welzl

  • Affiliations:
  • Department of Mathematics, Free University Berlin, Arnimallee 2-6, D-1000 BERLIN 33

  • Venue:
  • SCG '88 Proceedings of the fourth annual symposium on Computational geometry
  • Year:
  • 1988

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Abstract

The range searching problems which allow partition trees where every query enters only a sublinear number of nodes are characterized as those with finite Vapnik - Chervonenk is dimension.The concrete combinatorial bounds obtained imply—among others — that every set of n points in the planecan be stored in an &Ogr;(n) space data structure which allows triangle counting queries in &Ogr;(√n· log3n) time, andcan be stored in an &Ogr;(n · log n) space data structure which allows disk counting queries in &Ogr;(√n· log3n) time; the preprocessing time for the data structures is polynomial. Recent results by Chazelle entail that these bounds for space and query time are optimal up to polylog — factors.