We revisit tree compression with top trees (Bille et al. [2]), and present several improvements to the compressor and its analysis. By significantly reducing the amount of information stored and guiding the compression step using a RePair-inspired heuristic, we obtain a fast compressor achieving good compression ratios, addressing an open problem posed by [2]. We show how, with relatively small overhead, the compressed file can be converted into an in-memory representation that supports basic navigation operations in worst-case logarithmic time without decompression. We also show a much improved worst-case bound on the size of the output of top-tree compression (answering an open question posed in a talk on this algorithm by Weimann in 2012).
CITATION STYLE
Hübschle-Schneider, L., & Raman, R. (2015). Tree compression with top trees revisited. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 9125, pp. 15–27). Springer Verlag. https://doi.org/10.1007/978-3-319-20086-6_2
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