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.)
give nth decimal place of pi
Project Euler: Problem 9, Pythagorean numbers
Back to basics 12 - Input Arguments
Find out missing number from a vector of 9 elements
Given area find sides
PACMAT 09 - Awesome Tunnelling Ghosts, Equal Speed, 20 Lives, Game Download
Vectorize the digits of an Integer
USC Spring 2013 ACM: Building Snowmen
Criss-Cross: NHL - Optimize Matrix Size
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