= Advent of Code - 2021

See https://adventofcode.com/2021.

== Usage

[source,shell]
----
./run.rb <puzzle> <part>
----

where `<puzzle>` is a number from `1` - `25` and part is either `1` or `2`.

Puzzles are implemented as `puzzles/<puzzle>_<part>/{main.rb,input.txt}`.