Alphabet-independent compressed text indexing

  • Authors:
  • Djamal Belazzougui;Gonzalo Navarro

  • Affiliations:
  • LIAFA, Univ. Paris Diderot, Paris 7, France;Department of Computer Science, University of Chile

  • Venue:
  • ESA'11 Proceedings of the 19th European conference on Algorithms
  • Year:
  • 2011

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Abstract

Self-indexes can represent a text in asymptotically optimal space under the k-th order entropy model, give access to text substrings, and support indexed pattern searches. Their time complexities are not optimal, however: they always depend on the alphabet size. In this paper we achieve, for the first time, full alphabet-independence in the time complexities of self-indexes, while retaining space optimality. We obtain also some relevant byproducts on compressed suffix trees.