Day 16 was a doozy and took me a while because I tried a "dynamic programming" solution when I (think I) shouldn't have. Oh well! Got it in the end:
blog.notmet.net/2022/12/advent

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And here is a guy who has figured out a considerably better way to solve day 16. Lots of spoilers here: reddit.com/r/adventofcode/comm

It's that comment by zopatista that I'm talking about.

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