(==)                               _____   _             _
     /\                               |  _  |_| |_ _ ___ ___| |_
    /  \                              |     | . | | | -_|   |  _|
    /~~\λ                             |__|__|___|\_/|___|_|_|_|
   /λ   \                                 ___                        ___ ___ ___ ___
  /~~*~~~\                            ___|  _|                      |_  |   |_  |_  |
 λ/    λ \                           | . |  _|                      |  _| | |  _|_| |_
 /~~~~~~~~\~`                        |___|_|                        |___|___|___|_____|
/__*_______\                          _____       _
     ||    λ                         |     |___ _| |___
   \====/                            |   --| . | . | -_|
    \__/                             |_____|___|___|___|

Hello! Here are my Advent of Code 2021 solutions. Written in Haskell, trying not to use any external libraries (except hspec for testing) as some much needed FP practice.

Building/testing relies on Stack. A nix shell with it can be instantiated using nix-shell.

Building

To build:

> stack build

Running a challenge

One of the challenges can be computed via:

> stack exec -- aoc2021 <x>

For example, computing day 3's challenge:

> stack exec -- aoc2021 3

Testing

To test:

> stack test