Collection of Advent of Code solutions written in Rust. Each year lives in its own package, with a small CLI.

Make sure you have Rust installed. Then clone the repo and you're good to go:

cargo build

To run a specific day's solution, you'll need to edit the main.rs file of the corresponding year and call the solve function you want. For example, in aoc-<year>/src/main.rs:

fn main() {
    solutions::d15::solve_a();
}

Then run it with:

cargo run -p aoc-<year>

There's a helper CLI that saves you from the boring boilerplate. It has two commands:

cargo run -p scripts -- new <day>

This generates a fresh solution file at aoc-{year}/src/solutions/d{day}.rs with a basic template and registers it in the module. By default it uses the current year, but you can specify one:

cargo run -p scripts -- new 7 --year 2023

cargo run -p scripts -- data --day <day>

This fetches your puzzle input directly from adventofcode.com and saves it to the right spot. You'll need your session cookie from the site (grab it from your browser's dev tools after logging in).

The cookie can be provided via the COOKIE environment variable, or in an .env file:

COOKIE=your_cookie cargo run -p scripts -- data --day 7

You can also pass the cookie directly with --cookie, or specify a different year:

cargo run -p scripts -- data --cookie abc123 --day 7 --year 2023

If you don't pass --year, it defaults to the current year.