Advent of Code 2024 (C++)

Solutions for Advent of Code 2024 puzzles written in C++.

Solutions

Solutions are implemented by creating a new C++ source file in src/solutions and implementing the two functions declared include/aoc2024/solution.hpp, one for each of the day's puzzles. The inputs for the day should be placed in a text file located in src/input.

The entry point is defined in src/main.cpp, and already implements basic command line parsing and file handling logic.

The program accepts the following arguments:

1. <input_filename>: Path to the file containing the inputs for the day.
2. <solution>: Selects which puzzle to solve for, a for the first puzzle, and b for the second one.

A sample implementation is provided in src/solutions/day00.cpp, with its inputs in src/input/day00.txt.

Building

To build a solution, use the following compiler flags: -std=c++26 -Iinclude

• Note: Only ONE implementation of solution.hpp should be provided.

# Ensure output directory exists and build the solution
$ mkdir -p build; g++ -std=c++26 -Iinclude -o build/dayXX ./src/main.cpp ./src/solutions/dayXX.cpp

Automation

aoc2024.sh is a shell script for automating the process of implementing and running solutions by making use of GNU Make. The script will create all the necessary files/targets for building and running solutions.

Note that the script was designed to use paths relative to the root directory of this repository and will refuse to run if called from elsewhere.

The script accepts two commands:

• new <solution>: Cretes a new solution by creating an empty input file and the source file implementing solution.hpp. Two Make targets for building and running the solution will also be created.
• run <solution> [args]: Runs a solution with the specified command line arguments. If the executable is not found in the build directory, the build target is invoked first.

Example usage:

# Ensure the execute file mode bit is set for your user:
$ chmod u+x ./aoc2024.sh

# To create a new solution (e.g. Day 1 of the event):
$ ./aoc2024.sh new day01

# To build and run the first puzzle of the solution:
$ ./aoc2024.sh run day01 a