Lempel–Ziv factorization using less time & space
Chen, G., Puglisi, S.J. and Smyth, W.F. (2008) Lempel–Ziv factorization using less time & space. Mathematics in Computer Science, 1 (4). pp. 605-623.
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For 30 years the Lempel–Ziv factorization LZ x of a string x = x[1..n] has been a fundamental data structure of string processing, especially valuable for string compression and for computing all the repetitions (runs) in x. Traditionally the standard method for computing LZ x was based on Θ(n)-time (or, depending on the measure used, O(n log n)-time) processing of the suffix tree ST x of x. Recently Abouelhoda et al. proposed an efficient Lempel–Ziv factorization algorithm based on an “enhanced” suffix array – that is, a suffix array SA x together with supporting data structures, principally an “interval tree”. In this paper we introduce a collection of fast space-efficient algorithms for LZ factorization, also based on suffix arrays, that in theory as well as in many practical circumstances are superior to those previously proposed; one family out of this collection achieves true Θ(n)-time alphabet-independent processing in the worst case by avoiding tree structures altogether.
|Publication Type:||Journal Article|
|Publisher:||SP Birkhäuser Verlag Basel|
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