Efficient algorithms for Lempel-Ziv encoding
Efficient algorithms for Lempel-Ziv encoding
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Lempel-Ziv 编码的高效算法
DOI:
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发表时间:
1996
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通讯作者:
W. Rytter
中科院分区:
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作者:
L. Gąsieniec;Marek Karpinski;Wojciech Plandowski;W. Rytter
We consider several basic problems for texts and show that if the input texts are given by their Lempel-Ziv codes then the problems can be solved deterministically in polynomial time in the case when the original (uncompressed) texts are of exponential size. The growing importance of massively stored information requires new approaches to algorithms for compressed texts without decompressing. Denote by LZ(ω) the version of a string ω produced by Lempel-Ziv encoding algorithm. For given compressed strings LZ(T), LZ(P) we give the first known deterministic polynomial time algorithms to compute compressed representations of the set of all occurrences of the patternP in T, all periods of T, all palindromes of T, and all squares of T. Then we consider several classical language recognition problems: