LZ78compressed

LZ78compressed is a data compression algorithm. It was developed by Abraham Lempel and Jacob Ziv in 1978. The algorithm works by building a dictionary of phrases encountered in the input data. When a phrase is repeated, instead of storing the entire phrase again, it stores a reference to the previously seen phrase in the dictionary and the next character. This dictionary grows dynamically as the data is processed. When compressing, the algorithm reads the input stream and searches for the longest match in its dictionary. If a match is found, it outputs the code for that match and the next character. If no match is found, it adds the new character to the dictionary and outputs the code for the previous match (or a special code for an empty string) followed by the new character. Decompression involves reading the compressed stream and rebuilding the dictionary in the same way. When a code is encountered, the corresponding phrase is retrieved from the dictionary and appended to the output. New entries are added to the dictionary as they are encountered. LZ78 is a lossless compression method, meaning that the original data can be perfectly reconstructed from the compressed data. It forms the basis for many other compression algorithms, including LZW (Lempel-Ziv-Welch).