Post #1446415

@piko @blinry You can see my scruffy handwritten notes on an approach here https://z80.timholyoake.uk/advent-of-code-2025-in-fortran-77-mostly/ along with a link to my repository with my final version in it. It's written in fixed width Fortran, but uses recursion, so is a bit of a hybrid between legacy and modern Fortran! It should be relatively readable though as the final code includes comments.