Advent of Code 2025

Solutions for Advent of Code 2025 written in Rust.

Project Structure

This is a Cargo workspace containing:

• utils/ - Shared utilities for all days (Direction, Point, Solution trait)
• dayXX/ - Individual day solutions

Running Solutions

Run a specific day

cd day01
cargo run

Run all days

# From workspace root
for day in day*/; do
    echo "Running $day"
    (cd "$day" && cargo run)
done

Testing

Test a specific day

cd day01
cargo test

Test all days

cargo test --workspace

Utilities

The utils crate provides common functionality:

Solution Trait

Standardized structure for daily solutions:

use utils::{run_solution, Solution};

struct Day01;

impl Solution for Day01 {
    type Input = Vec<i32>;
    type Output = i32;

    fn parse_input(&self, input: &str) -> Self::Input {
        // Parse logic here
    }

    fn part1(&self, data: &Self::Input) -> Self::Output {
        // Part 1 solution
    }

    fn part2(&self, data: &Self::Input) -> Self::Output {
        // Part 2 solution
    }
}

fn main() {
    run_solution!(Day01);
}

Direction Enum

8-directional movement with (x, y) coordinates:

use utils::Direction;

let pos = (0, 0);
let new_pos = pos + Direction::Right;  // (1, 0)

Point Type

Generic point implementation:

use utils::Point;

let p1 = Point::new(10, 20);
let p2 = Point::new(15, 25);
let distance = p1.manhattan_distance(&p2);

Adding New Days

This project uses aoc-cli-v2, a custom CLI tool for managing Advent of Code solutions.

Installation

cargo install --git https://github.com/TomPlanche/aoc-cli-v2

Usage

# Add a new day solution template
aoc-cli add <day>

# Download input for a specific day
aoc-cli download <day>

# Submit an answer
aoc-cli submit <day> <part> <answer>

The tool automatically:

• Creates the day folder structure
• Sets up the solution template with the Solution trait
• Downloads your personalized input from adventofcode.com
• Submits answers directly from the command line

Progress

• Day 1
• Day 2
• Day 3
• Day 4
• Day 5
• Day 6
• Day 7
• Day 8
• Day 9
• Day 10
• Day 11
• Day 12
• Day 13
• Day 14
• Day 15
• Day 16
• Day 17
• Day 18
• Day 19
• Day 20
• Day 21
• Day 22
• Day 23
• Day 24
• Day 25

Notes

[Add any general notes, patterns, or observations across the challenges]