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- W2023893309 abstract "A subsequence of a given string is any string obtained by deleting none or some symbols from the given string. A longest common subsequence (LCS) of two strings is a common subsequence of both that is as long as any other common subsequences. The problem is to find the LCS of two given strings. The bound on the complexity of this problem under the decision tree model is known to be mn if the number of distinct symbols that can appear in strings is infinite, where m and n are the lengths of the two strings, respectively, and m/spl les/n. In this paper, we propose two parallel algorithms far this problem on the CREW-PRAM model. One takes O(log/sup 2/ m + log n) time with mn/log m processors, which is faster than all the existing algorithms on the same model. The other takes O(log/sup 2/ m log log m) time with mn/(log/sup 2/ m log log m) processors when log/sup 2/ m log log m > log n, or otherwise O(log n) time with mn/log n processors, which is optimal in the sense that the time/spl times/processors bound matches the complexity bound of the problem. Both algorithms exploit nice properties of the LCS problem that are discovered in this paper.< <ETX xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>></ETX>" @default.
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- W2023893309 title "Parallel algorithms for the longest common subsequence problem" @default.
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