My C++20 solutions to the puzzles of Advent of Code 2024 (to learn myself some C++ and cmake). I'm using my small header-only library (aoclib) which I created for last year's Advent of Code.
As the creator of Advent of Code does not allow/encourage sharing your own puzzle inputs, I only put example puzzle inputs into input/ publicly, so you can at least run those if you don't have your own puzzle inputs.
My answers are correct for my puzzle inputs (and for the example inputs), but in my experience it is definitely possible to come up with incorrect code which may produce the correct answers for your own puzzle input, but which might not work for all other possible/legal puzzle inputs. (I put the answers to my puzzle inputs and to the example inputs as comments at the very top of the source-files for each day.)
You need a C++20 compiler and cmake.
Navigate to the top level of this repository (the directory where CMakeLists.txt is located) and create your build directories, for instance:
mkdir -p build/Release build/Debug
Then, run:
cmake -DCMAKE_BUILD_TYPE=Release -S . -B build/Release
cmake -DCMAKE_BUILD_TYPE=Debug -S . -B build/Debug
to generate the release build system into your build directory build/Release (and the debug build system into your build directory build/Debug). (If you do not run the commands at the top level of this repository, you have to run them with -S path-to-this-repo instead of -S . like above.)
You can also set -DCMAKE_RUNTIME_OUTPUT_DIRECTORY= if you want to use a custom output directory for the compiled binaries; by default, they will be put into the bin/ directory at the root of this repository.
Run
cmake --build build/Release --target day-nn
to build the release-mode executable for day-nn (or run cmake --build build/Release to build the release-mode executables for all days, but this might take a while).
The resulting executable will be called day-nn (or day-nn_dbg for debug builds). By default, it will be put into the bin/ directory at the root of this repository (or into the directory you specified with -DCMAKE_RUNTIME_OUTPUT_DIRECTORY= in step 1).
(For example: Run cmake --build build/Release --target day-03 to build the release-mode executable which solves Day 3. It will be put into bin/day-03 by default. Or run cmake --build build/Debug --target day-03 to build the debug-mode executable bin/day-03_dbg instead, assuming you generated the debug build system into 'build/Debug' in step 1.)
Run bin/day-nn input_day_nn.txt to compute and print the solutions (part 1 and part 2) for day-nn (with input_day_nn.txt being your puzzle input for that day). If you don't have your own puzzle inputs, you can use the example inputs from the input/ directory.
Usage: day-nn [-help] puzzle_input [-v]
-v: use verbose output (optional)
-help: print this help, ignore the rest, and quit (optional)
puzzle_input: your puzzle input file (optional/ignored if -help is used)
You can also build and run day-nn in one step with cmake --build build/Release --target run-day-nn, but this assumes you have saved your puzzle input for day-nn as input/day-nn.txt within this repository.
If you don't have your own puzzle inputs but still want to test the executable for day-nn, you can build and run with cmake --build build/Release --target run-day-nn-example (which uses the puzzle's example input input/day-nn-example.txt automatically).
For example: cmake --build build/Release --target run-day-06-example to build and run the release-mode executable for day-06 with the example input input/day-06-example.txt