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Reconstructing General Matching Graphs

Authors Amihood Amir, Michael Itzhaki

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Author Details

Amihood Amir
  • Department of Computer Science, Bar Ilan University, Ramat Gan 52900, Israel
  • Georgia Tech, College of Computing, Atlanta, GA, USA
Michael Itzhaki
  • Department of Computer Science, Bar Ilan University, Ramat Gan 52900, Israel

Funding

  • Amir, Amihood: Partially supported by ISF grant 168/23 and BSF grant 2018-141.
  • Itzhaki, Michael: Partially supported by ISF grant 168/23.

Cite As Get BibTex

Amihood Amir and Michael Itzhaki. Reconstructing General Matching Graphs. In 35th Annual Symposium on Combinatorial Pattern Matching (CPM 2024). Leibniz International Proceedings in Informatics (LIPIcs), Volume 296, pp. 2:1-2:15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024) https://doi.org/10.4230/LIPIcs.CPM.2024.2

Abstract

The classical pattern matching paradigm is that of seeking occurrences of one string in another, where both strings are drawn from an alphabet set Σ. Motivated by many applications, algorithms were developed for pattern matching where the matching relation is not necessarily the "=" relation. Examples are pattern matching with "don't cares", approximate matching, less-than matching, Cartesian-tree matching, order preserving matching, parameterized matching, degenerate matching, function matching, and more. Some of the matchings above allow for efficient pattern matching algorithms, while others do not.
Much work has not been done on categorization of the complexity of various string matching queries based on the type of matching. For example, when can exact matching be done fast? When can approximate matching be calculated fast? When can tandem or palindrome recognition be efficiently calculated?
This paper defines the matching graph of a given string under a matching relation. We show that the type of graph affects various string algorithms. The matching graph can also be a tool for lower bounds. We provide a lower bound for finding palindromes in a general degenerate graph. We also show some results in recognizing the minimum alphabet required for reconstructing a string that presents a given matching graph.

Subject Classification

ACM Subject Classification
  • Theory of computation → Pattern matching
Keywords
  • Pattern Matching
  • Matching Graphs
  • Reconstruction
  • NP-hardness

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