answer.code: In function ‘std::vector<int> longest_trip(int, int)’:
answer.code:27:25: error: ‘sp’ was not declared in this scope; did you mean ‘sb’?
   27 |                         sp.pop_back();
      |                         ^~
      |                         sb
answer.code:42:29: error: ‘sp’ was not declared in this scope; did you mean ‘sb’?
   42 |                             sp.pop_back();
      |                             ^~
      |                             sb
answer.code:55:29: error: ‘sp’ was not declared in this scope; did you mean ‘sb’?
   55 |                             sp.pop_back();
      |                             ^~
      |                             sb
answer.code:66:38: error: ‘b’ was not declared in this scope
   66 |             else if(are_connected(vi{b},vi{sb.back()})){
      |                                      ^
answer.code:66:39: error: no matching function for call to ‘std::vector<int>::vector(<brace-enclosed initializer list>)’
   66 |             else if(are_connected(vi{b},vi{sb.back()})){
      |                                       ^
In file included from /usr/include/c++/13/vector:66,
                 from /usr/include/c++/13/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:53,
                 from answer.code:1:
/usr/include/c++/13/bits/stl_vector.h:704:9: note: candidate: ‘template<class _InputIterator, class> constexpr std::vector<_Tp, _Alloc>::vector(_InputIterator, _InputIterator, const allocator_type&) [with <template-parameter-2-2> = _InputIterator; _Tp = int; _Alloc = std::allocator<int>]’
  704 |         vector(_InputIterator __first, _InputIterator __last,
      |         ^~~~~~
/usr/include/c++/13/bits/stl_vector.h:704:9: note:   template argument deduction/substitution failed:
/usr/include/c++/13/bits/stl_vector.h:675:7: note: candidate: ‘constexpr std::vector<_Tp, _Alloc>::vector(std::initializer_list<_Tp>, const allocator_type&) [with _Tp = int; _Alloc = std::allocator<int>; allocator_type = std::allocator<int>]’
  675 |       vector(initializer_list<value_type> __l,
      |       ^~~~~~
/usr/include/c++/13/bits/stl_vector.h:675:7: note:   conversion of argument 1 would be ill-formed:
/usr/include/c++/13/bits/stl_vector.h:656:7: note: candidate: ‘constexpr std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, std::__type_identity_t<_Alloc>&) [with _Tp = int; _Alloc = std::allocator<int>; std::__type_identity_t<_Alloc> = std::allocator<int>]’
  656 |       vector(vector&& __rv, const __type_identity_t<allocator_type>& __m)
      |       ^~~~~~
/usr/include/c++/13/bits/stl_vector.h:656:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/13/bits/stl_vector.h:637:7: note: candidate: ‘constexpr std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::false_type) [with _Tp = int; _Alloc = std::allocator<int>; allocator_type = std::allocator<int>; std::false_type = std::integral_constant<bool, false>]’
  637 |       vector(vector&& __rv, const allocator_type& __m, false_type)
      |       ^~~~~~
/usr/include/c++/13/bits/stl_vector.h:637:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/13/bits/stl_vector.h:632:7: note: candidate: ‘constexpr std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::true_type) [with _Tp = int; _Alloc = std::allocator<int>; allocator_type = std::allocator<int>; std::true_type = std::integral_constant<bool, true>]’
  632 |       vector(vector&& __rv, const allocator_type& __m, true_type) noexcept
      |       ^~~~~~
/usr/include/c++/13/bits/stl_vector.h:632:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/13/bits/stl_vector.h:621:7: note: candidate: ‘constexpr std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&, std::__type_identity_t<_Alloc>&) [with _Tp = int; _Alloc = std::allocator<int>; std::__type_identity_t<_Alloc> = std::allocator<int>]’
  621 |       vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
      |       ^~~~~~
/usr/include/c++/13/bits/stl_vector.h:621:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/13/bits/stl_vector.h:617:7: note: candidate: ‘constexpr std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&) [with _Tp = int; _Alloc = std::allocator<int>]’
  617 |       vector(vector&&) noexcept = default;
      |       ^~~~~~
/usr/include/c++/13/bits/stl_vector.h:617:7: note:   conversion of argument 1 would be ill-formed:
/usr/include/c++/13/bits/stl_vector.h:598:7: note: candidate: ‘constexpr std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&) [with _Tp = int; _Alloc = std::allocator<int>]’
  598 |       vector(const vector& __x)
      |       ^~~~~~
/usr/include/c++/13/bits/stl_vector.h:598:7: note:   conversion of argument 1 would be ill-formed:
/usr/include/c++/13/bits/stl_vector.h:566:7: note: candidate: ‘constexpr std::vector<_Tp, _Alloc>::vector(size_type, ...