Advent of Code Solutions 🎄

May 6, 2026 · View on GitHub

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My solutions to puzzles at adventofcode.com. Check out my collected tricks ✨ for solving AoC.

See also:

2024 Results

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All Results

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Development Setup

Per Environment

macOS

brew bundle install

Debian/Ubuntu

sed 's/#.*$//' < apt-packages.txt | xargs sudo apt-get -y install

Ruby

bundle install

JavaScript

npm install

Python

pip install -r requirements.txt

Fetch your AoC Session Cookie and set it up as an environment variable by either:

  • putting it a .env file in the repo's root dir as AOC_SESSION=...
  • export in your shell ('s startup file) as export AOC_SESSION=....
  • Or some other way according to Session Cookie Expired?

Solve a Puzzle

and now solve today's puzzle or a specific one:

bin/solve_day.sh           # Solve today's puzzle with default language (ruby)
bin/solve_day.sh 19/5      # 2019 day 5
bin/solve_day.sh -l py     # Solve with language, here Python

To fetch input for an already solved problem:

bin/fetch_input.sh yy/mm

Tip

The default language can be set with an envvar, e.g., with dotenv in a .env fil,e which is also read by bin/solve_day.sh:

echo AOC_LANG=py >> .env

Update AOC_SESSION in: