Solutions to the exercises at https://adventofcode.com/2021/.
Each day is a subproject within a shared workspace; this reduces recompilation required.
Uses aoctool for daily setup, and
aoclib for shared library functions.
As each day is a sub-crate built from a template, they all have a similar CLI interface. Each is smart enough to download its input if it does not exist, but use the existing file if it does. Just run the desired day by name; it'll run part 1. Part 2 can be run by adding a CLI flag.
cargo run -p day01 -- --part2