есть некоторая задумка по разработке определенного приложения
$ zstd --help
*** Zstandard CLI (64-bit) v1.5.5, by Yann Collet ***
Compress or decompress the INPUT file(s); reads from STDIN if INPUT is `-` or not provided.
Usage: zstd [OPTIONS...] [INPUT... | -] [-o OUTPUT]
Options:
-o OUTPUT Write output to a single file, OUTPUT.
-k, --keep Preserve INPUT file(s). [Default]
--rm Remove INPUT file(s) after successful (de)compression.
-# Desired compression level, where `#` is a number between 1 and 19;
lower numbers provide faster compression, higher numbers yield
better compression ratios. [Default: 3]
-d, --decompress Perform decompression.
if ((i % 10) + (i / 10) % 10 + (i / 100) % 10 == (i / 1000)
% 10 + (i / 10000) % 10 + (i / 100000) % 10) {