This is programm implements an LZ78 compressor and decompressor. COMMAND: lz78 OPTIONS: -c to compress the file -d to decompress a file -v to have verbose output -i [input_file] to specify the input file -o [output_file] to specify the output file, if not specified the output is given a default name -s [N] to specify in N, the dictionary size -k to compress a sequence from keyboard