On the Longest Common Rigid Subsequence Problem

  • Bin Ma
  • Kaizhong Zhang
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3537)


The longest common subsequence problem (LCS) and the closest substring problem (CSP) are two models for the finding of common patterns in strings. The two problem have been studied extensively. The former was previously proved to be not polynomial-time approximable within ratio n δ for a constant δ. The latter was previously proved to be NP-hard and have a PTAS. In this paper, the longest common rigid subsequence problem (LCRS) is studied. LCRS shares similarity with LCS and CSP and has an important application in motif finding in biological sequences. LCRS is proved to be Max-SNP hard in this paper. An exact algorithm with quasi-polynomial average running time is also provided.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Bin Ma
    • 1
  • Kaizhong Zhang
    • 1
  1. 1.Department of Computer ScienceUniversity of Western OntarioLondonCanada

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