Random suffix search trees

  • Authors:
  • Luc Devroye;Ralph Neininger

  • Affiliations:
  • School of Computer Science, McGill University, 3480 University Street, Montreal, 1-13A 2K6, Canada;School of Computer Science, McGill University, 3480 University Street, Montreal, 1-13A 2K6, Canada

  • Venue:
  • Random Structures & Algorithms
  • Year:
  • 2003

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Abstract

A random suffix search tree is a binary search tree constructed for the suffixes Xi = 0. BiBi+1Bi+2 ... of a sequence B1, B2, B3 .... of independent identically distributed random b-ary digits Bj. Let Dn denote the depth of the node for Xn in this tree when B1 is uniform on Zb. We show that for any value of b 1, EDn = 2 log n + O(log2log n), just as for the random binary search tree. We also show that Dn/EDn → 1 in probability.