Advent of Code 2025

 

Solutions for Advent of Code 2025 written in Rust 🦀

Prerequisites

• Rust (2024 edition or later)

Getting Started

git clone https://github.com/barclayd/advent-of-code-2025.git
cd advent-of-code-2025
cargo build
cargo test

Scripts

Start a new day

Prerequisites:

• Get your AoC Session Cookie

This can be done by copying the value by going to https://adventofcode.com/ and opening Dev Tools. Chrome: Application => Cookies => https://adventofcode.com/ => session: <value> Copy the value and paste it into a newly created .env, based on .env.local

brew install pup
./scripts/new-day.sh

• This will generate a new folder with a template ready to be worked on, including test setup and a blank a test.txt.

test.txt requires manual copying and pasting from the puzzle html at present

Get input

./scripts/puzzle-input.sh

This command auto generates your input.txt file and places it in the latest day folder.

For example, if you are working on a solution for Day 4, it will place it in /day-04/input.txt, ready to be used in your solution.

It is to be run when you have understood the puzzle and your tests locally for test.txt are passing.

Project Structure

advent-of-code-2025/
├── day-01/
├── day-02/
├── day-03/
...
└── README.md

Continuous Integration

This project uses GitHub Actions for continuous integration. The workflow:

• Runs on every push to mainand pull request against main
• Tests solution for every day

The workflow configuration can be found in .github/workflows/ci.yml. These run in a parallelized matrix.

Progress (24/24 ⭐️)

Day	Challenge	Stars
1	Secret Entrance	⭐️⭐️
2	Gift Shop	⭐️⭐️
3	Lobby	⭐️⭐️
4	Printing Department	⭐⭐
5	Cafeteria	⭐⭐
6	Trash Compactor	⭐⭐
7	Laboratories	⭐⭐
8	Playground	⭐⭐
9	Movie Theatre	⭐⭐
10	Factory	⭐⭐
11	Reactor	⭐⭐
12	Christmas Tree Farm	⭐⭐