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.)
create a circulant matrix
Derivative of polynomial
The sum of the numbers in the vector
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
AVIRIS Hyperspectral Bit Mask
Hyperspectral Processing: Determine Material Components given a Hyperspectral vector
GJam 2014 China Rd B: Party
GJam 2011 Africa Qual A: Maximum Loop Size
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