lcs: Find longest common sublist of two lists

[ library, list ] [ Propose Tags ]

Provides a function lcs that takes two lists and returns a longest common sublist. For example, lcs "abcd" "acbd" is either "abd" or "acd".

The package provides a simple, stupid and (most of all) slow implementation that needs, for inputs of length m and n, O(m+n) space and O((m+n)!) time in the worst case.

It also provides an implementation of the Hunt-Szymanski LCS algorithm, based on that in "String searching algorithms" by Graham A Stephen, ISBN 981021829X.

Given inputs xs and ys of length m and n respectively, where there are r pairs (x, y) where x is in xs, y is in ys and x == y, Hunt-Szymanski needs O(r+m+n) space and O((r+m+n)*log(m+n)) time. Thus this is O((m+n)^2) space and O((m+n)^2*log(m+n)) time in the worst case.

Versions 0.2
Dependencies array, base [details]
License LicenseRef-OtherLicense
Copyright Ian Lynagh, 2005
Author Ian Lynagh
Maintainer igloo@earth.li
Category List
Home page http://urchin.earth.li/~ian/cabal/lcs/
Uploaded by IanLynagh at Fri Feb 1 17:01:45 UTC 2008
Distributions NixOS:0.2
Downloads 1030 total (16 in the last 30 days)
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