answer.code: In function ‘std::vector<int> longest_trip(int, int)’:
answer.code:14:16: error: ‘are_connected’ was not declared in this scope
   14 |             if(are_connected({i}, {i+1})){
      |                ^~~~~~~~~~~~~
answer.code:58:16: error: ‘are_connected’ was not declared in this scope
   58 |             if(are_connected({s1.back()}, {i})){
      |                ^~~~~~~~~~~~~
answer.code:85:8: error: ‘are_connected’ was not declared in this scope
   85 |     if(are_connected(s1Ep, s2Ep)){
      |        ^~~~~~~~~~~~~
answer.code:173:1: warning: control reaches end of non-void function [-Wreturn-type]
  173 | }
      | ^