These programs are CUDA C programs of implementing the Huffman Coding with Gap Arrays. This coding is proposed in
Naoya Yamamoto, Koji Nakano, Yasuaki Ito, and Daisuke Takafuji (Hiroshima University) and Akihiko Kasagi and Tsuguchika Tabaru (Fujitsu Laboratories Ltd.), "Huffman Coding with Gap Arrays for GPU Acceleration," 49th International Conference on Parallel Processing (ICPP) 2020, https://doi.org/10.1145/3404397.3404429, pp.1-11, August 2020.