answer.code: In function ‘int min_cardinality(int)’:
answer.code:37:16: error: ‘n’ was not declared in this scope
   37 |         FORO(i,n){
      |                ^
answer.code:6:36: note: in definition of macro ‘FORO’
    6 | #define FORO(i,n) for(int i = 0; i<n; i++)
      |                                    ^
answer.code:39:17: error: ‘move_inside’ was not declared in this scope
   39 |                 move_inside(i);
      |                 ^~~~~~~~~~~
answer.code:45:43: error: ‘press_button’ was not declared in this scope
   45 |                                 int tmp = press_button();
      |                                           ^~~~~~~~~~~~
answer.code:50:33: error: ‘move_outside’ was not declared in this scope
   50 |                                 move_outside(j);
      |                                 ^~~~~~~~~~~~
answer.code:54:17: error: ‘move_outside’ was not declared in this scope
   54 |                 move_outside(i);
      |                 ^~~~~~~~~~~~