Advent of Code

The famous programming competition: adventofcode.com. Below are instructions on how to run the solutions.

2023–present (and somewhat 2019)

> cat Y2023/input/day-1.txt | cabal run y2023:day-1

> cd Y2022
> cat input/day-1.txt | cabal run day-1.hs

ghc Main.hs
Main DAY

Most solutions are single-file and runnable with cabal run <filename.hs> (or cabal new-run ... if you haven't upgraded to Cabal 3 yet).