Top-k document retrieval in optimal space

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Abstract

We present an index for top-k most frequent document retrieval whose space is |CSA|+o(n)+DlognD+O(D) bits, and its query time is O(logklog2 +Ïμn) per reported document, where D is the number of documents, n is the sum of lengths of the documents, and |CSA| is the space of the compressed suffix array for the documents. This improves over previous results for this problem, whose space complexities are |CSA|+ω(n) or 2|CSA|+ω(1).

Original languageEnglish
Pages (from-to)440-443
Number of pages4
JournalInformation Processing Letters
Volume113
Issue number12
DOIs
StatePublished - 17 Apr 2013

Keywords

  • Data structures
  • Document retrieval
  • Text indexing

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