There is no need to test all cases. The ideal case is a swiss cheese in which no guest share a wall. Just start filling rooms from there if needed (the only problems is that room filling must follow an order, which makes the code quite large (but repetitive and boring), and there are two base cases for the swiss cheese structure). Maybe it's possible to create a function and decrease code size, but unless you see it at the moment that you are coding it, it would mean loosing too much time during competition when a Ctrl+C, Ctrl+V would be faster (and better than testing all cases).
Currently, my solutions and this one are the only that don't use brute force, but this one is the smallest. Congrats. :) (I was able to create a smaller solution after looking at your code.)
surface of a spherical planet
Poker Series 04: isFlush
Back to basics 13 - Input variables
System of equations
Number of digits in an integer
Sokoban: Puzzle 10.45
GJam March 2016 IOW: Password Single
Hyperspectral Processing: Determine Material Components given a Hyperspectral vector
ICFP2021 Hole-In-Wall: Figure Validation
GJam: 2013 Rd1a Bullseye Painting - Large Numbers
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