This one reminded of the image language in SICP so I tried to replicate that with a module for handling the tiles. It ended up working out pretty well. Still, Day20 was pretty long in comparison to the rest of the days.
felix-alonso
blue_quartz
Not sure if it’s too late, but here’s my day 20 solution if anyone’s interested.
advent20/day20.ex at master · h-j-k/advent20 (github.com)
I’ve also documented my walkthrough if you want to understand the logic behind the steps I’ve taken… advent20/README.md at master · h-j-k/advent20 (github.com)
1
Hallski
I rewrote my Day 20 for part 2 yesterday to get the last star.
My first implementation made the same assumptions and worked really well for the test code but broke on the real data. I thought it was due to those assumptions and rewrote it into a solution that searched through all possibilities until it found the solution.
When copying some code to optimise my second implementation I realised the bug in my first implementation.
def vflip({dir, str}) do
case dir do
- :top -> {:top, str}
+ :top -> {:bottom, str}
:left -> {:left, String.reverse(str)}
- :bottom -> {:bottom, str}
+ :bottom -> {:top, str}
:right -> {:right, String.reverse(str)}
end
Fixing that in my initial solution made it work and ran in 0.2s instead of the 6s for the new one.
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