answer.code: In function ‘int determine(int, int)’:
answer.code:20:9: error: ‘move_inside’ was not declared in this scope
   20 |         move_inside(i);
      |         ^~~~~~~~~~~
answer.code:23:14: error: ‘press_button’ was not declared in this scope
   23 |         if ( press_button() > limit ) {
      |              ^~~~~~~~~~~~
answer.code:24:13: error: ‘move_outside’ was not declared in this scope
   24 |             move_outside(i);
      |             ^~~~~~~~~~~~
answer.code:32:13: error: ‘move_outside’ was not declared in this scope
   32 |             move_outside(i);
      |             ^~~~~~~~~~~~
answer.code: In function ‘int min_cardinality(int)’:
answer.code:45:5: error: ‘n_insects’ was not declared in this scope; did you mean ‘insects’?
   45 |     n_insects = determine(1, -1);
      |     ^~~~~~~~~
      |     insects