answer.code: In function ‘int main()’:
answer.code:36:45: error: ‘a’ was not declared in this scope
   36 |                                 if (s.find({a[p][3], p}) != s.end()) {
      |                                             ^
answer.code:36:43: error: no matching function for call to ‘std::set<std::array<int, 2> >::find(<brace-enclosed initializer list>)’
   36 |                                 if (s.find({a[p][3], p}) != s.end()) {
      |                                     ~~~~~~^~~~~~~~~~~~~~
In file included from /usr/include/c++/13/set:63,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:158,
                 from answer.code:1:
/usr/include/c++/13/bits/stl_set.h:806:9: note: candidate: ‘template<class _Kt> decltype (std::set<_Key, _Compare, _Alloc>::iterator{((std::set<_Key, _Compare, _Alloc>*)this)->std::set<_Key, _Compare, _Alloc>::_M_t._M_find_tr(__x)}) std::set<_Key, _Compare, _Alloc>::find(const _Kt&) [with _Key = std::array<int, 2>; _Compare = std::less<std::array<int, 2> >; _Alloc = std::allocator<std::array<int, 2> >]’
  806 |         find(const _Kt& __x)
      |         ^~~~
/usr/include/c++/13/bits/stl_set.h:806:9: note:   template argument deduction/substitution failed:
answer.code:36:43: note:   couldn’t deduce template parameter ‘_Kt’
   36 |                                 if (s.find({a[p][3], p}) != s.end()) {
      |                                     ~~~~~~^~~~~~~~~~~~~~
/usr/include/c++/13/bits/stl_set.h:812:9: note: candidate: ‘template<class _Kt> decltype (std::set<_Key, _Compare, _Alloc>::const_iterator{((const std::set<_Key, _Compare, _Alloc>*)this)->std::set<_Key, _Compare, _Alloc>::_M_t._M_find_tr(__x)}) std::set<_Key, _Compare, _Alloc>::find(const _Kt&) const [with _Key = std::array<int, 2>; _Compare = std::less<std::array<int, 2> >; _Alloc = std::allocator<std::array<int, 2> >]’
  812 |         find(const _Kt& __x) const
      |         ^~~~
/usr/include/c++/13/bits/stl_set.h:812:9: note:   template argument deduction/substitution failed:
answer.code:36:43: note:   couldn’t deduce template parameter ‘_Kt’
   36 |                                 if (s.find({a[p][3], p}) != s.end()) {
      |                                     ~~~~~~^~~~~~~~~~~~~~
/usr/include/c++/13/bits/stl_set.h:796:7: note: candidate: ‘std::set<_Key, _Compare, _Alloc>::iterator std::set<_Key, _Compare, _Alloc>::find(const key_type&) [with _Key = std::array<int, 2>; _Compare = std::less<std::array<int, 2> >; _Alloc = std::allocator<std::array<int, 2> >; iterator = std::_Rb_tree<std::array<int, 2>, std::array<int, 2>, std::_Identity<std::array<int, 2> >, std::less<std::array<int, 2> >, std::allocator<std::array<int, 2> > >::const_iterator; key_type = std::array<int, 2>]’
  796 |       find(const key_type& __x)
      |       ^~~~
/usr/include/c++/13/bits/stl_set.h:796:28: note:   no known conversion for argument 1 from ‘<brace-enclosed initializer list>’ to ‘const std::set<std::array<int, 2> >::key_type&’ {aka ‘const std::array<int, 2>&’}
  796 |       find(const key_type& __x)
      |            ~~~~~~~~~~~~~~~~^~~
/usr/include/c++/13/bits/stl_set.h:800:7: note: candidate: ‘std::set<_Key, _Compare, _Alloc>::const_iterator std::set<_Key, _Compare, _Alloc>::find(const key_type&) const [with _Key = std::array<int, 2>; _Compare = std::less<std::array<int, 2> >; _Alloc = std::allocator<std::array<int, 2> >; const_iterator = std::_Rb_tree<std::array<int, 2>, std::array<int, 2>, std::_Identity<std::array<int, 2> >, std::less<std::array<int, 2> >, std::allocator<std::array<int, 2> > >::const_iterator; key_type = std::array<int, 2>]’
  800 |       find(const key_type& __x) const
      |       ^~~~
/usr/include/c++/13/bits/stl_set.h:800:28: note:   no known conversion for argument 1 from ‘<brace-enclosed initializer list>’ to ‘const std::set<std::array<int, 2> >::key_type&’ {aka ‘const std::array<int, 2>&’}
  800 |       find(const key_type& __x) const
      |            ~~~~~~~~~~~~~~~~^~~
answer.code:37:48: error: no matching function for call to ‘std::set<std::array<int, 2> >::erase(<brace-enclosed initializer list>)’
   37 |                                         s.erase({a[p][3], p});
      |                                         ~~~~~~~^~~~~~~~~~~~~~
/usr/include/c++/13/bits/stl_set.h:656:7: note: candidate: ‘std::set<_Key, _Compare, _Alloc>::iterator std::set<_Key, _Compare, _Alloc>::erase(const_iterator) [with _Key = std::array<int, 2>; _Compare = std::less<std::array<int, 2> >; _Alloc = std::allocator<std::array<int, 2> >; iterator = std::_Rb_tree<std::array<int, 2>, std::array<int, 2>, std::_Identity<std::array<int, 2> >, std::less<std::array<int, 2> >, std::allocator<std::array<int, 2> > >::const_iterator; const_iterator = std::_Rb_tree<std::array<int, 2>, std::array<int, 2>, std::_Identity<std::array<int, 2> >, std::less<std::array<int, 2> >, std::allocator<std::array<int, 2> > >::const_iterator]’
  656 |       erase(const_iterator __position)
      |       ^~~~~
/usr/in...