Advent of Code Solutions

C++ solutions for Advent of Code challenges.

Project Structure

.
├── 2015/
│   └── 01/
│       ├── CMakeLists.txt
│       └── solution.cpp
├── inputs/              # Git submodule for private inputs
│   └── 2015/
│       └── 01/
│           └── input.txt
├── main.cpp            # Main entry point
└── CMakeLists.txt      # Top-level build configuration

Requirements

• CMake 3.20 or higher
• C++20 compatible compiler (GCC 10+, Clang 12+)
• Python 3 (for the new_day.py script)

Building

cmake -B build
cmake --build build

Running

./build/aoc <year> <day>

Example:

./build/aoc 2015 1

Adding New Solutions

Use the provided script to automatically create a new day:

./new_day.py <year> <day>

Example:

./new_day.py 2015 2

This will:

• Create the directory structure (YYYY/DD/)
• Generate CMakeLists.txt with proper configuration
• Create solution.cpp from template
• Create placeholder input file (inputs/YYYY/DD/input.txt)

Then simply:

1. Add your puzzle input to inputs/YYYY/DD/input.txt
2. Implement the solution in YYYY/DD/solution.cpp
3. Rebuild: cmake --build build
4. Run: ./build/aoc YYYY DD

The build system automatically discovers all YYYY/DD/ directories, so no manual CMake configuration needed!

Input Files

Input files are kept in a separate git submodule to maintain privacy. See inputs/README.md for instructions on setting up the submodule.