As a warmup for this year’s Advent of Code, I’m re-reading and posting my solutions to last year’s challenges. You can read, run and edit today’s solution by following the post link.
After a few days of gentle introductory challenges, things ramped up a little today. Not due to the difficulty of the puzzle itself, but the unhelpful way in which the input data was formatted :-). Given that increase in difficulty, I think a lot of people were expecting part 2 to be a Towers of Hanoi challenge, but no, it was just a simple change to part 1.
BTW, you will need to be careful to preserve the trailing whitespaces on the first few lines iof the
testdatastring if you edit it, as my code lazily relies on it being there.