Advent of Code Go

Creating a new day

make new YEAR=2021 DAY=1

This creates the day structure and adds the import to main.go.

Running solutions

go run . -year 2021 -day 1           # Run with actual input
go run . -year 2021 -day 1 -example  # Run with example input

Input files go in input/YEAR/DAY/actual.txt and input/YEAR/DAY/example.txt.

Auto-fetch inputs (optional)

To automatically download inputs, create a .env file with your session cookie:

1. Log in to adventofcode.com
2. Open dev tools (F12) → Application/Storage → Cookies
3. Copy the session cookie value
4. Add to .env: AOC_SESSION_COOKIE=your_cookie_here