# Advent Of Code 2021 > Find the sleigh key to save Santa, using your smol submarine! ## What This repository hosts the code that I produced to solve the different puzzles provided for the Advent of Code 2021, that you can find [here](https://adventofcode.com/2021). ## How In order to solve the different puzzles, I used the **Rust** programming language, as I wanted a way to experiment and practice this new language. There are no dependencies and no external crate. To execute it, just open the specific day you want to run, and use `cargo run --release -- ./input`. Replacing the `input` file **should** work without any code modification. ## Why Because puzzles are fun! And Rust is fun too! ## Yikes The code produced may not be optimal nor the fastest. And that's normal, I tried to spend less than a day (and to do it in my spare time after school). The code is also very ugly for a reason: usually I use single letters for the variable names. Usually it's fine. For me. For other people re reading me, it's less fun. So I forced myself to use mainly single characters as variable names, just to make me want to stop doing it.