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.)
So many choices
Reverse the vector
Similar Triangles - find the height of the tree
Spot the outlier
The Dark Side of the Die
GJam 2012 Qualifier: Tongues
Unique: Faster for options 'rows' and 'stable' for large array of uint8
GJam 2015 Rd1B: Counter Culture
Battleship_010 : (TM) Classic Game - Methodical Bot (100 move max)
USC Fall 2012 ACM : Chemical Analysis
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