/in/foo.cc: In function 'int main()':
/in/foo.cc:56:20: error: 'a' was not declared in this scope
   printf("%d\n",gg[a][b]/2);
                    ^
/in/foo.cc:56:23: error: 'b' was not declared in this scope
   printf("%d\n",gg[a][b]/2);
                       ^