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LF Successor: Compact Space Indexing for Order-Isomorphic Pattern Matching

Authors Arnab Ganguly, Dhrumil Patel, Rahul Shah, Sharma V. Thankachan

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Arnab Ganguly
  • Department of Computer Science, University of Wisconsin - Whitewater, WI, USA
Dhrumil Patel
  • School of EECS, Louisiana State University, Baton Rouge, LA, USA
Rahul Shah
  • School of EECS, Louisiana State University, Baton Rouge, LA, USA
Sharma V. Thankachan
  • Department of Computer Science, University of Central Florida, Orlando, FL, USA

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Arnab Ganguly, Dhrumil Patel, Rahul Shah, and Sharma V. Thankachan. LF Successor: Compact Space Indexing for Order-Isomorphic Pattern Matching. In 48th International Colloquium on Automata, Languages, and Programming (ICALP 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 198, pp. 71:1-71:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)
https://doi.org/10.4230/LIPIcs.ICALP.2021.71

Abstract

Two strings are order isomorphic iff the relative ordering of their characters is the same at all positions. For a given text T[1,n] over an ordered alphabet of size σ, we can maintain an order-isomorphic suffix tree/array in O(nlog n) bits and support (order-isomorphic) pattern/substring matching queries efficiently. It is interesting to know if we can encode these structures in space close to the text’s size of nlogσ bits. We answer this question positively by presenting an O(nlog σ)-bit index that allows access to any entry in order-isomorphic suffix array (and its inverse array) in t_{SA} = {O}(log²n/logσ) time. For any pattern P given as a query, this index can count the number of substrings of T that are order-isomorphic to P (denoted by occ) in {O}((|P|logσ+t_{SA})log n) time using standard techniques. Also, it can report the locations of those substrings in additional O(occ ⋅ t_{SA}) time.

Subject Classification

ACM Subject Classification
  • Theory of computation → Pattern matching
Keywords
  • Succinct data structures
  • Pattern Matching

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References

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