Driver code
if __name__ == ' _ _ main _ _ ' : NEW_LINE INDENT grid = [ [ 1 , 1 , 3 , 2 , 1 ] , [ 3 , 2 , 2 , 1 , 2 ] , [ 1 , 3 , 3 , 1 , 3 ] , [ 1 , 2 , 3 , 1 , 2 ] , [ 1 , 1 , 1 , 3 , 1 ] ] NEW_LINE n = len ( grid [ 0 ] ) NEW_LINE DEDENT