Optimal bounds for the predecessor problem and related problems

  • Authors:
  • Paul Beame;Faith E. Fich

  • Affiliations:
  • Computer Science and Engineering, University of Washington, Seattle, Washington;Department of Computer Science, University of Toronto, Toronto, Ontario, Canada M5S 1A4

  • Venue:
  • Journal of Computer and System Sciences - STOC 1999
  • Year:
  • 2002

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Abstract

We obtain matching upper and lower bounds for the amount of time to find the predecessor of a given element among the elements of a fixed compactly stored set. Our algorithms are for the unit-cost word RAM with multiplication and are extended to give dynamic algorithms. The lower bounds are proved for a large class of problems, including both static and dynamic predecessor problems, in a much stronger communication game model, but they apply to the cell probe and RAM models.