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I found this one surprisingly tricky, perhaps because I started using tags for everything, and it made the code really ugly, because of all the conversions (in order to iterate over the tags), and it also meant that every field (
drink
,activity
, etc.) had to be treated separately, there was special logic everywhere, yuck.I also tried to write a more general algorithm that would work for other constraint-satisfaction problems such as Sudokus, but again it was a bit ugly.
So I ended up with a kind of boring solution, I'm not super happy with it, but I'm not sure how to improve it.