Advent of Code!

My answers to the Advent of Code annual challenges, in a few different languages.

I like teaching people how to code better, and I like learning how to code better! Don't hesitate to reach out if you haave questions about what I've done, or if you have comments on how I could do it better.

A few notes:

C

Covers 2020. Some C problems have multiple implementations, following the following schema. Makefiles aren't included as they're all straightforward one-file scripts, I might change this if I need to link multiple files together on larger problems:

1. dayNN.c files just use stdlib C99
2. dayNN_omp.c files are built to run using OpenMP for shared memory parallelism. Make sure you have libomp on your machine, and make sure you know how to compile them (with GCC this is just gcc -fopenmp, if you're living that LLVM life clang can require you to explicitly pass the preprocessor instructuons with clang -Xpreprocessor -fopenmp -lomp
3. dayNN_mpi.c files are built to run with MPI message-passing parallelism. These must be compiled with mpicc and executed with mpirun

All C files are intended to be run on STDIN, this could be from an input redirect (dayNN < inputs/dayNN.txt) or piped from an AoC command line tool (I use Blitzen by kunalb). Both approaches work fine on the parallelised code as well.

Fortran

Fortran solutions are written to be shiny modern 2008/2018 Coarray Fortran, though many will compile as far back as Fortran 90. I use the GCC Fortran compiler, so should be easy enough to compile.

Python

Some of these are silly solutions for fun. All python solutions take the name of an input file as their only argument. Files are used instead of STDIN to align with a work competition I was organising for Python users.

All standard library Python, except for one or two that make use of NumPy