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Discrete Mathematics & Theoretical Computer Science |
Maxime Crochemore ; Costas S. Iliopoulos ; M. Sohel Rahman - Optimal Prefix and Suffix Queries on Texts
dmtcs:3541 - Discrete Mathematics & Theoretical Computer Science, January 1, 2007, DMTCS Proceedings vol. AH, 2007 Conference on Analysis of Algorithms (AofA 07) - https://doi.org/10.46298/dmtcs.3541
1,2; Costas S. Iliopoulos 2; M. Sohel Rahman 2
- 1 Laboratoire d'Informatique Gaspard-Monge
- 2 Department of Computer Science [London]
In this paper, we study a restricted version of the position restricted pattern matching problem introduced and studied by Mäkinen and Navarro [Position-Restricted Substring Searching, LATIN 2006]. In the problem handled in this paper, we are interested in those occurrences of the pattern that lies in a suffix or in a prefix of the given text. We achieve optimal query time for our problem against a data structure which is an extension of the classic suffix tree data structure. The time and space complexity of the data structure is dominated by that of the suffix tree. Notably, the (best) algorithm by Mäkinen and Navarro, if applied to our problem, gives sub-optimal query time and the corresponding data structure also requires more time and space.