answer.code: In function ‘int main()’:
answer.code:105:18: warning: structured bindings only available with ‘-std=c++17’ or ‘-std=gnu++17’ [-Wc++17-extensions]
  105 |         for(auto [x, y] : boundary_cells){
      |                  ^
answer.code:147:18: warning: structured bindings only available with ‘-std=c++17’ or ‘-std=gnu++17’ [-Wc++17-extensions]
  147 |         for(auto [u, v] : forced_edges){
      |                  ^
answer.code:164:30: warning: structured bindings only available with ‘-std=c++17’ or ‘-std=gnu++17’ [-Wc++17-extensions]
  164 |                         auto [x, y] = boundary_cells[i];
      |                              ^
answer.code:301:22: warning: structured bindings only available with ‘-std=c++17’ or ‘-std=gnu++17’ [-Wc++17-extensions]
  301 |                 auto [x, y] = forced_path_ends[i];
      |                      ^
answer.code:327:26: warning: structured bindings only available with ‘-std=c++17’ or ‘-std=gnu++17’ [-Wc++17-extensions]
  327 |                 for(auto [x, y] : segs_for_nested_check[s]){
      |                          ^
answer.code:328:34: warning: structured bindings only available with ‘-std=c++17’ or ‘-std=gnu++17’ [-Wc++17-extensions]
  328 |                         for(auto [c, d] : segs_for_nested_check[s]){
      |                                  ^
answer.code:345:18: warning: structured bindings only available with ‘-std=c++17’ or ‘-std=gnu++17’ [-Wc++17-extensions]
  345 |         for(auto [x, y] : all_edges){
      |                  ^
answer.code: In lambda function:
answer.code:419:28: error: missing template arguments before ‘{’ token
  419 |                 return pair{a.top_idx, a.bot_idx} < pair{b.top_idx, b.bot_idx};
      |                            ^
answer.code:419:28: error: expected ‘;’ before ‘{’ token
  419 |                 return pair{a.top_idx, a.bot_idx} < pair{b.top_idx, b.bot_idx};
      |                            ^
      |                            ;
answer.code:419:49: error: expected ‘;’ before ‘}’ token
  419 |                 return pair{a.top_idx, a.bot_idx} < pair{b.top_idx, b.bot_idx};
      |                                                 ^
      |                                                 ;
answer.code:419:51: error: expected primary-expression before ‘<’ token
  419 |                 return pair{a.top_idx, a.bot_idx} < pair{b.top_idx, b.bot_idx};
      |                                                   ^
answer.code:419:57: error: missing template arguments before ‘{’ token
  419 |                 return pair{a.top_idx, a.bot_idx} < pair{b.top_idx, b.bot_idx};
      |                                                         ^
In file included from /usr/include/c++/13/bits/stl_algobase.h:71,
                 from /usr/include/c++/13/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:51,
                 from answer.code:1:
/usr/include/c++/13/bits/predefined_ops.h: In instantiation of ‘constexpr bool __gnu_cxx::__ops::_Iter_comp_iter<_Compare>::operator()(_Iterator1, _Iterator2) [with _Iterator1 = __gnu_cxx::__normal_iterator<main()::path_candidate*, std::vector<main()::path_candidate> >; _Iterator2 = __gnu_cxx::__normal_iterator<main()::path_candidate*, std::vector<main()::path_candidate> >; _Compare = main()::<lambda(auto:4, auto:5)>]’:
/usr/include/c++/13/bits/stl_algo.h:1819:14:   required from ‘void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<main()::path_candidate*, vector<main()::path_candidate> >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(auto:4, auto:5)> >]’
/usr/include/c++/13/bits/stl_algo.h:1859:25:   required from ‘void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<main()::path_candidate*, vector<main()::path_candidate> >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(auto:4, auto:5)> >]’
/usr/include/c++/13/bits/stl_algo.h:1950:31:   required from ‘void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<main()::path_candidate*, vector<main()::path_candidate> >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(auto:4, auto:5)> >]’
/usr/include/c++/13/bits/stl_algo.h:4894:18:   required from ‘void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = __gnu_cxx::__normal_iterator<main()::path_candidate*, vector<main()::path_candidate> >; _Compare = main()::<lambda(auto:4, auto:5)>]’
answer.code:418:6:   required from here
/usr/include/c++/13/bits/predefined_ops.h:158:30: error: void value not ignored as it ought to be
  158 |         { return bool(_M_comp(*__it1, *__it2)); }
      |                       ~~~~~~~^~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/predefined_ops.h: In instantiation of ‘bool __gnu_cxx::__ops::_Val_comp_iter<_Compare>::operat...