The randomized complexity of maintaining the minimum

  • Authors:
  • Gerth Stølting Brodal;Shiva Chaudhuri;Jaikumar Radhakrishnan

  • Affiliations:
  • BRICS, Department of Computer Science, University of Aarhus, Ny Munkegade, DK-8000 Århus C, Denmark;Max-Planck Institut für Informatik, Im Stadtwald, 66123 Saarbrücken, Germany;Tata Institute of Fundamental Research, Mumbai, India

  • Venue:
  • Nordic Journal of Computing
  • Year:
  • 1996

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Abstract

The complexity of maintaining a set under the operations Insert, Delete and FindMin is considered. In the comparison model it is shown that any randomized algorithm with expected amortized cost t comparisons per Insert and Delete has expected cost at least n/(e22t)-1 comparisons for FindMin. If FindMin is replaced by a weaker operation. FindAny, then it is shown that a randomized algorithm with constant expected cost per operation exists; in contrast, it is shown that no deterministic algorithm can have constant cost per operation. Finally, a deterministic algorithm with constant amortized cost per operation for an offline version of the problem is given.