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@Greenbank
See a couple of people have got day 22p2. Took a while to get back to mine but seem to have got there in the end with a very suboptimal algorithm.
Definitely a little bit of wee came out first time I saw a matching answer for the example input:-
Horrible code, way too messy, hacks everywhere. Takes ages even on the example input. Will bash my head against it again tomorrow, sort it out and clean it up.