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Sliding Windows over Context-Free Languages

Authors Moses Ganardi, Artur Jez, Markus Lohrey



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Moses Ganardi
  • Universität Siegen, Germany
Artur Jez
  • University of Wrocław, Poland
Markus Lohrey
  • Universität Siegen, Germany

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Moses Ganardi, Artur Jez, and Markus Lohrey. Sliding Windows over Context-Free Languages. In 43rd International Symposium on Mathematical Foundations of Computer Science (MFCS 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 117, pp. 15:1-15:15, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2018)
https://doi.org/10.4230/LIPIcs.MFCS.2018.15

Abstract

We study the space complexity of sliding window streaming algorithms that check membership of the window content in a fixed context-free language. For regular languages, this complexity is either constant, logarithmic or linear [Moses Ganardi et al., 2016]. We prove that every context-free language whose sliding window space complexity is log_2(n) - omega(1) must be regular and has constant space complexity. Moreover, for every c in N, c >= 1 we construct a (nondeterministic) context-free language whose sliding window space complexity is O(n^(1/c)) \ o(n^(1/c)). Finally, we give an example of a deterministic one-counter language whose sliding window space complexity is Theta((log n)^2).

Subject Classification

ACM Subject Classification
  • Theory of computation → Streaming models
Keywords
  • sliding windows
  • streaming algorithms
  • context-free languages

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References

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