Linear-Time Text Compression by Longest-First Substitution

  title={Linear-Time Text Compression by Longest-First Substitution},
  author={Ryosuke Nakamura and Shunsuke Inenaga and Hideo Bannai and Takashi Funamoto and Masayuki Takeda and Ayumi Shinohara},
We consider grammar-based text compression with longest first substitution (LFS), where non-overlapping occurrences of a longest repeating factor of the input text are replaced by a new non-terminal symbol. We present the first linear-time algorithm for LFS. Our algorithm employs a new data structure called sparse lazy suffix trees . We also deal with a more sophisticated version of LFS, called LFS2, that allows better compression. The first linear-time algorithm for LFS2 is also presented. 
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