Grammar Compressed Sequences with Rank/Select Support
arXiv:1911.09077 · doi:10.1016/j.jda.2016.10.001
Abstract
Sequence representations supporting not only direct access to their symbols, but also rank/select operations, are a fundamental building block in many compressed data structures. Several recent applications need to represent highly repetitive sequences, and classical statistical compression proves ineffective. We introduce, instead, grammar-based representations for repetitive sequences, which use up to 6% of the space needed by statistically compressed representations, and support direct access and rank/select operations within tens of microseconds. We demonstrate the impact of our structures in text indexing applications.
This research has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Actions H2020-MSCA-RISE-2015 BIRDS GA No. 690941