@RogerBW This is rather neat code! My solution is similar, but the code is much messier, as for the other AoC puzzles, and mixed with equally messy comments. Actually noted it a few times that my AoC solutions are much worse than what I would normally write, even in a hurry, but the combination of having a self-imposed deadline and writing what essentially is throwaway code nudged me towards that mess.
@defanor Thanks! I deliberately don't try for leaderboards but I can't ever quite forget that I'm not going to come back to this code again. I'm sure I could have optimised this more but I ran out of enthusiasm. (As with 24.2 this evening, I can see a method but I'm not going to implement it tonight.)
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