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• W2249554505 abstract "Grammar-based compression, where one replaces a long string by a small context-free grammar that generates the string, is a simple and powerful paradigm that captures many popular compression schemes. In this paper, we present new representations of grammars that supports efficient finger search style access, random access, and longest common extensions queries. Let $S$ be a string of length $N$ compressed into a context-free grammar $mathcal{S}$ of size $n$. We present the following. - An $O(n)$ space representation that supports setting a finger at any position $f$ in $O(log N)$ time, and subsequently supporting access to any position $i$ in time $O(log |f - i|)$. - An $O(N^epsilon n^{1-epsilon})$ space representation that supports random access to any position in constant time. - Two representations that support longest common extensions queries in either $O(N^{frac{1}{2}+epsilon} n^{frac{1}{2}-epsilon})$ space and $O(1)$ time or $O(n)$ space and $O(log N + log^2 ell)$ time where $ell$ is the length of the longest common extension. All of the above bounds significantly improve the currently best known results. To achieve the bounds we introduce several new data structural techniques of independent interest, including a new van Emde Boas style decomposition for grammars." @default.
• W2249554505 created "2016-06-24" @default.
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• W2249554505 date "2015-07-10" @default.
• W2249554505 modified "2023-09-27" @default.
• W2249554505 title "Finger Search, Random Access, and Longest Common Extensions in Grammar-Compressed Strings." @default.
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