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🎄 Advent of Code 2023

Solutions for Advent of Code in Rust.

Benchmarks

Day Part 1 Part 2
Day 1 66.0µs 658.4µs
Day 2 42.3µs 50.0µs
Day 3 447.4µs 432.1µs
Day 4 97.3µs 19.3ms
Day 5 30.3µs 26.5s
Day 6 543.0ns 38.1ms
Day 7 123.6µs 123.0µs
Day 8 255.4µs 1.7ms
Day 9 107.0µs 109.6µs

Total: 26561.61ms

Usage

Scaffold a day

# example: `cargo scaffold 1`
cargo scaffold <day>

# output:
# Created module file "src/bin/01.rs"
# Created empty input file "data/inputs/01.txt"
# Created empty example file "data/examples/01.txt"
# ---
# 🎄 Type `cargo solve 01` to run your solution.

Individual solutions live in the ./src/bin/ directory as separate binaries. Inputs and examples live in the the ./data directory.

Every solution has tests referencing its example file in ./data/examples. Use these tests to develop and debug your solutions against the example input.

Tip

If a day has different example inputs for both parts, you can use the read_file_part() helper in your tests instead of read_file(). For example, if this applies to day 1, you can create a second example file 01-2.txt and invoke the helper like let result = part_two(&advent_of_code::template::read_file_part("examples", DAY, 2)); to read it in test_part_two.

Tip

when editing a solution, rust-analyzer will display buttons for running / debugging unit tests above the unit test blocks.

Download input & description for a day

Important

This command requires installing the aoc-cli crate.

# example: `cargo download 1`
cargo download <day>

# output:
# [INFO  aoc] 🎄 aoc-cli - Advent of Code command-line tool
# [INFO  aoc_client] 🎅 Saved puzzle to 'data/puzzles/01.md'
# [INFO  aoc_client] 🎅 Saved input to 'data/inputs/01.txt'
# ---
# 🎄 Successfully wrote input to "data/inputs/01.txt".
# 🎄 Successfully wrote puzzle to "data/puzzles/01.md".

Run solutions for a day

# example: `cargo solve 01`
cargo solve <day>

# output:
#     Finished dev [unoptimized + debuginfo] target(s) in 0.13s
#     Running `target/debug/01`
# Part 1: 42 (166.0ns)
# Part 2: 42 (41.0ns)

The solve command runs your solution against real puzzle inputs. To run an optimized build of your code, append the --release flag as with any other rust program.

By default, solve executes your code once and shows the execution time. If you append the --time flag to the command, the runner will run your code between 10 and 10.000 times (depending on execution time of first execution) and print the average execution time.

For example, running a benchmarked, optimized execution of day 1 would look like cargo solve 1 --release --time. Displayed timings show the raw execution time of your solution without overhead like file reads.

Submitting solutions

Important

This command requires installing the aoc-cli crate.

In order to submit part of a solution for checking, append the --submit <part> option to the solve command.

Run all solutions

cargo all

# output:
#     Running `target/release/advent_of_code`
# ----------
# | Day 01 |
# ----------
# Part 1: 42 (19.0ns)
# Part 2: 42 (19.0ns)
# <...other days...>
# Total: 0.20ms

This runs all solutions sequentially and prints output to the command-line. Same as for the solve command, the --release flag runs an optimized build.

Update readme benchmarks

The template can output a table with solution times to your readme. In order to generate a benchmarking table, run cargo all --release --time. If everything goes well, the command will output "Successfully updated README with benchmarks." after the execution finishes and the readme will be updated.

Please note that these are not "scientific" benchmarks, understand them as a fun approximation. 😉 Timings, especially in the microseconds range, might change a bit between invocations.

Run all tests

cargo test

To run tests for a specific day, append --bin <day>, e.g. cargo test --bin 01. You can further scope it down to a specific part, e.g. cargo test --bin 01 part_one.

Format code

cargo fmt

Lint code

cargo clippy

Read puzzle description in terminal

Important

This command requires installing the aoc-cli crate.

# example: `cargo read 1`
cargo read <day>

# output:
# Loaded session cookie from "/Users/<snip>/.adventofcode.session".
# Fetching puzzle for day 1, 2022...
# ...the input...

Optional template features

Configure aoc-cli integration

  1. Install aoc-cli via cargo: cargo install aoc-cli --version 0.12.0
  2. Create an .adventofcode.session file in your home directory and paste your session cookie. To retrieve the session cookie, press F12 anywhere on the Advent of Code website to open your browser developer tools. Look in Cookies under the Application or Storage tab, and copy out the session cookie value. 1

Once installed, you can use the download command, the read command, and automatically submit solutions via the --submit flag.

Check code formatting / clippy lints in CI

Uncomment the respective sections in the ci.yml workflow.

Use VS Code to debug your code

  1. Install rust-analyzer and CodeLLDB.
  2. Set breakpoints in your code. 2
  3. Click Debug next to the unit test or the main function. 3
  4. The debugger will halt your program at the specific line and allow you to inspect the local stack. 4

Useful crates

  • itertools: Extends iterators with extra methods and adaptors. Frequently useful for aoc puzzles.
  • regex: Official regular expressions implementation for Rust.

A curated list of popular crates can be found on blessred.rs.

Do you have aoc-specific crate recommendations? Share them!

Common pitfalls

  • Integer overflows: This template uses 32-bit integers by default because it is generally faster - for example when packed in large arrays or structs - than using 64-bit integers everywhere. For some problems, solutions for real input might exceed 32-bit integer space. While this is checked and panics in debug mode, integers wrap in release mode, leading to wrong output when running your solution.

Footnotes

Footnotes

  1. The session cookie might expire after a while (~1 month) which causes the downloads to fail. To fix this issue, refresh the .adventofcode.session file.

  2. Set a breakpoint
  3. Run debugger
  4. Inspect debugger state