lcs: Find longest common sublist of two lists
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 [RSS] [faq]||0.2|
|Dependencies||array, base [details]|
|Copyright||Ian Lynagh, 2005|
|Uploaded||by IanLynagh at 2008-02-01T17:01:45Z|
|Downloads||2041 total (13 in the last 30 days)|
|Rating||(no votes yet) [estimated by Bayesian average]|
Docs uploaded by user
Build status unknown [no reports yet]