Advent of Code

Solutions for Advent of Code challenges implemented primarily in Go.

Prerequisites

• Go 1.21.4 or higher
• A valid Advent of Code session cookie

Installation

1. Clone the repository

2. Set up your Advent of Code session cookie as an environment variable:

export AOC_SESSION=your_session_cookie_here

You can find your session cookie by:

1. Logging into Advent of Code
2. Opening browser developer tools
3. Going to Application/Storage > Cookies
4. Copying the value of the 'session' cookie

Running Solutions

Run a specific day's solution:

go run cmd/main.go <day>

For example, to run day 1:

go run cmd/main.go 1

If no day is specified, it will default to day 1.

Project Structure

• /cmd/main.go - Main entry point
• /internal/dayN - Solutions for each day
• /inputs - Input files (automatically downloaded and cached)

Testing

Run tests for a specific day:

go test ./internal/day1

Run all tests:

go test ./...

Features

• Automatic input fetching and caching
• Performance timing for solutions
• Modular structure for easy addition of new days