Welcome to my repository where I share my solutions to the Advent of Code 2023 challenges, tackled using the good old C programming language. Advent of Code is an annual December event where programmers solve fun, holiday-themed puzzles.
Each puzzle solution is compiled into its own standalone executable, named in accordance with its corresponding day.
For instance, the executable for the first puzzle is day01.
By default, these executables search for their respective input files located at input/dayXX.txt, where XX represents the two-digit day number (e.g., 01 for Day 1).
Alternatively, you have the option to provide input via a command-line argument.
For example, you can run ./day01 mine.txt to specify a different input file.
Each puzzle in this repository is accompanied by tests, which are designed using both the examples provided in the puzzle and the actual input.txt file.
Since sharing the puzzle input data is discouraged, the inputs have been encrypted.
Note: Tests using the actual input.txt have to be enabled at compile time with the -Dhave-inputs=true option (this only make sense if you have my input.txt files since your answers will differ from mine).
meson setup --buildtype=release -Db_lto=true -Dhave-inputs=true build
ninja -C build testmeson setup --buildtype=debugoptimized -Db_sanitize=address -Db_lundef=false -Dhave-inputs=true build_debug
ninja -C build_debug testThe solutions were tested on different processors using hyperfine and/or poop. Compiled using clang 16 and LTO.
| Day | Intel i7-11850H | AMD Ryzen 5 PRO 4650U |
|---|---|---|
| 1 | 276 µs | 520 µs |
| 2 | 185 µs | 434 µs |
| 3 | 231 µs | 501 µs |
| 4 | 368 µs | 679 µs |
| 5 | 1.4 s | 2.6 s |
| 6 | 200 µs | 472 µs |
| 7 | 2.6 ms | 3.54 ms |
| 8 | 462.4 µs | 1 ms |
| 9 | 256 µs | 464 µs |
| 10 | 5.8 ms | 16.4 ms |
| 11 | 980 µs | 1.7 ms |
| 12 | 347 ms | 554 ms |
| 13 | 248 µs | 486 µs |
| 14 | 44 ms | 53.4 ms |
| 15 | 1.1 ms | 1 ms |
| 16 | 34.4 ms | 33.5 ms |
| 17 | 315.3 ms | 604 ms |
| 18 | 173 µs | 379 µs |
| 19 | 422 µs | 891 µs |
| 19 | 16.8 ms |
Special thanks to the authors of these very useful C resources:
- Cauldron - A collection of useful C code snippets and utilities.
- C Algorithms - A library of common data structures and algorithms written in C.
- CTL - A library for container types for C.
- CTest - A unit testing framework for C.
- Log.c - A simple logging library implemented in C.
- Sort - A collection of sorting algorithms implemented in C.
- str - yet another string library for C language.
- xxhash - Extremely fast non-cryptographic hash algorithm.
- slice99 - Memory slices for C99.