answer.code: In function ‘int min_cardinality(int)’:
answer.code:33:9: error: ‘move_inside’ was not declared in this scope
   33 |         move_inside(i);
      |         ^~~~~~~~~~~
answer.code:36:19: error: ‘press_button’ was not declared in this scope
   36 |         int res = press_button();
      |                   ^~~~~~~~~~~~
answer.code:39:13: error: ‘move_outside’ was not declared in this scope
   39 |             move_outside(i);
      |             ^~~~~~~~~~~~
answer.code:56:13: error: ‘move_inside’ was not declared in this scope
   56 |             move_inside(i);
      |             ^~~~~~~~~~~
answer.code:60:23: error: ‘press_button’ was not declared in this scope
   60 |             int res = press_button();
      |                       ^~~~~~~~~~~~
answer.code:63:17: error: ‘move_outside’ was not declared in this scope
   63 |                 move_outside(i);
      |                 ^~~~~~~~~~~~