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.)
Construct a string from letters and counts
Find best placement for ordered dominoes (harder)
Find number of days
Largest Twin Primes
Chezz_020 Pawn Attack and Slaying King
Angle between Two Vectors
Mastermind IV: Optimal Solver - max of 5 guesses
Criss_Cross_010 : Unique elements, Square array, Words in one array
Memory Map File: Access and Update
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