Advent of Code 2021

Small code to solve problems at https://adventofcode.com/2021.
Most of the code are written in Rust.

How to run solutions

For example, to run the code for Day 1: Sonar Sweep:

$ cargo run --bin day01 inputs/day01.txt

You may also add --release flag for a more optimized binary:

$ cargo run --release --bin day01 inputs/day01.txt

Shortcut command:

$ ./run inputs/day01.txt

Approaches and considerations

1. My goal with Advent of Code 2021 is to dip my toe into Rust language and ecosystem, and to figure out how to transfer my code style into new language. Code performance and quality are important; submission speed is not.
2. I use AOC solution checker to validate the logic behind my initial solutions. However, the source files shown in this repo might be a version improved upon those solutions.
3. Unless the input data is simple, data definitions will be explicitly defined alongside with FromStr trait.
4. Explicit type annotations are minimal. They are inferred and hinted inline by IDE most of the time, so I did not bother.
5. No mindless usage of Option::unwrap() and Result::unwrap().
6. Rust external crates are fair game, unless the problem would have become too trivial.