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Issue No.03 - March (2011 vol.23)
pp: 321-334
Qingguo Wang , University of Missouri, Columbia
Dmitry Korkin , University of Missouri, Columbia
Yi Shang , University of Missouri, Columbia
ABSTRACT
Finding the longest common subsequence (LCS) of multiple strings is an NP-hard problem, with many applications in the areas of bioinformatics and computational genomics. Although significant efforts have been made to address the problem and its special cases, the increasing complexity and size of biological data require more efficient methods applicable to an arbitrary number of strings. In this paper, we present a new algorithm for the general case of multiple LCS (or MLCS) problem, i.e., finding an LCS of any number of strings, and its parallel realization. The algorithm is based on the dominant point approach and employs a fast divide-and-conquer technique to compute the dominant points. When applied to a case of three strings, our algorithm demonstrates the same performance as the fastest existing MLCS algorithm designed for that specific case. When applied to more than three strings, our algorithm is significantly faster than the best existing sequential methods, reaching up to 2-3 orders of magnitude faster speed on large-size problems. Finally, we present an efficient parallel implementation of the algorithm. Evaluating the parallel algorithm on a benchmark set of both random and biological sequences reveals a near-linear speedup with respect to the sequential algorithm.
INDEX TERMS
Longest common subsequence (LCS), multiple longest common subsequence (MLCS), dynamic programming, dominant point method, divide and conquer, parallel processing, multithreading.
CITATION
Qingguo Wang, Dmitry Korkin, Yi Shang, "A Fast Multiple Longest Common Subsequence (MLCS) Algorithm", IEEE Transactions on Knowledge & Data Engineering, vol.23, no. 3, pp. 321-334, March 2011, doi:10.1109/TKDE.2010.123
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