Grading Sheme:
--------------

Correctness/complexity of the implementation.                 /7.0
  Compiles                                                  /1
  Doesn't crash.                                            /1
  Works per spec.                                           /3
  Algo (i.e. not hardcoded copy-pasted code and parameters) /2

Getting grid address through the stack.                     /1.5
Returning result through the stack.                         /1.5

Total                                                         /10