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• W2964197518 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. Given a grammar, the random access problem is to compactly represent the grammar while supporting random access, that is, given a position in the original uncompressed string report the character at that position. In this paper we study the random access problem with the finger search property, that is, the time for a random access query should depend on the distance between a specified index f, called the finger, and the query index i. We consider both a static variant, where we first place a finger and subsequently access indices near the finger efficiently, and a dynamic variant where also moving the finger such that the time depends on the distance moved is supported. Let n be the size the grammar, and let N be the size of the string. For the static variant we give a linear space representation that supports placing the finger in O(log N) time and subsequently accessing in O(log D) time, where D is the distance between the finger and the accessed index. For the dynamic variant we give a linear space representation that supports placing the finger in O(log N) time and accessing and moving the finger in O(log D + log log N) time. Compared to the best linear space solution to random access, we improve a O(log N) query bound to O(log D) for the static variant and to O(log D + log log N) for the dynamic variant, while maintaining linear space. As an application of our results we obtain an improved solution to the longest common extension problem in grammar compressed strings. To obtain our results, we introduce several new techniques of independent interest, including a novel van Emde Boas style decomposition of grammars." @default.
• W2964197518 created "2019-07-30" @default.
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• W2964197518 date "2018-01-11" @default.
• W2964197518 modified "2023-10-11" @default.
• W2964197518 title "Finger Search in Grammar-Compressed Strings" @default.
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• W2964197518 doi "https://doi.org/10.1007/s00224-017-9839-9" @default.
• W2964197518 hasPublicationYear "2018" @default.
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