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.)
fly fly away
Construct a string from letters and counts
Back to basics 22 - Rotate a matrix
Calculate the probability that at least two people in a group share the same birthday.
Make a vector of prime numbers
USC Fall 2012 ACM : Chemical Analysis
Mastermind IV: Optimal Solver - max of 5 guesses
Checkerz_000 Kamikazi Kings
Angle between Two Vectors
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