Advent of Code solutions

Solutions to Advent of Code problems in Rust.

Running locally

The command line tool takes <year> <day> <part> as arguments and reads the problem input from stdin:

$ echo 14 | cargo run -q 2019 1 1
2

Installing from homebrew

The command-line tool can be installed as a brew tap:

$ brew install fornwall/tap/advent-of-code
$ echo 14 | advent-of-code 2019 1 1

Published crate

This crate is published to crates.io/crates/advent-of-code.

As a library it exposes a solve(year, day, part, input) function as documented on docs.rs/advent-of-code:

// Using the dependency added: advent-of-code = "*":
use advent_of_code::solve;

fn main() {
    assert_eq!(solve(2019, 1, 1, "14"), Ok("2".to_string()));
}

It also contains the command line program to run the solution:

$ cargo install advent-of-code
$ echo 14 | advent-of-code 2019 1 1
2

Docker image on Docker Hub

The command line interface is published to a fredrikfornwall/advent-of-code Docker image:

$ docker pull fredrikfornwall/advent-of-code:latest
$ echo 14 | docker run -i fredrikfornwall/advent-of-code:latest 2019 1 1
2

Generating flamegraphs on macOS

Install flamegraph with cargo install flamegraph and build a benchmark binary with:

RUSTFLAGS='-g' cargo build --release --bench benchmark

This will create a benchmark binary under something like ls ../../target/release/deps/benchmark-31ba773f80f7f5d8. Then profile and generate a flamegraph.svg by running

sudo flamegraph ../../target/release/deps/benchmark-31ba773f80f7f5d8  --bench 2020_07_1