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.)
Solve the set of simultaneous linear equations
Return unique values without sorting
Replicate elements in vectors
Find nearest prime number less than input number
Find out missing number from a vector of 9 elements
ismember: Enhanced Time Performance for 'rows' - Speed Scoring (90% savings)
Kaggle: Reverse Game of Life - Periods of Oscillators
PACMAT - Ghosts Random; 3 Lives
Image Processing 01: Vignetting Correction
GJam 2014 China Rd B: Dragon Maze
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