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:2:
/usr/include/c++/13/bits/stl_set.h: In instantiation of ‘void std::set<_Key, _Compare, _Alloc>::insert(_InputIterator, _InputIterator) [with _InputIterator = long long int; _Key = std::pair<long long int, long long int>; _Compare = std::less<std::pair<long long int, long long int> >; _Alloc = std::allocator<std::pair<long long int, long long int> >]’:
answer.code:54:38:   required from here
/usr/include/c++/13/bits/stl_set.h:569:38: error: no matching function for call to ‘std::_Rb_tree<std::pair<long long int, long long int>, std::pair<long long int, long long int>, std::_Identity<std::pair<long long int, long long int> >, std::less<std::pair<long long int, long long int> >, std::allocator<std::pair<long long int, long long int> > >::_M_insert_range_unique(long long int&, long long int&)’
  569 |         { _M_t._M_insert_range_unique(__first, __last); }
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/13/map:62,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:152:
/usr/include/c++/13/bits/stl_tree.h:1100:9: note: candidate: ‘template<class _InputIterator> std::__enable_if_t<std::is_same<_Val, typename std::iterator_traits<_InputIterator>::value_type>::value> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_range_unique(_InputIterator, _InputIterator) [with _Key = std::pair<long long int, long long int>; _Val = std::pair<long long int, long long int>; _KeyOfValue = std::_Identity<std::pair<long long int, long long int> >; _Compare = std::less<std::pair<long long int, long long int> >; _Alloc = std::allocator<std::pair<long long int, long long int> >]’
 1100 |         _M_insert_range_unique(_InputIterator __first, _InputIterator __last)
      |         ^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/stl_tree.h:1100:9: note:   template argument deduction/substitution failed:
/usr/include/c++/13/bits/stl_tree.h: In substitution of ‘template<class _InputIterator> std::__enable_if_t<std::is_same<std::pair<long long int, long long int>, typename std::iterator_traits< <template-parameter-1-1> >::value_type>::value, void> std::_Rb_tree<std::pair<long long int, long long int>, std::pair<long long int, long long int>, std::_Identity<std::pair<long long int, long long int> >, std::less<std::pair<long long int, long long int> >, std::allocator<std::pair<long long int, long long int> > >::_M_insert_range_unique(_InputIterator, _InputIterator) [with _InputIterator = long long int]’:
/usr/include/c++/13/bits/stl_set.h:569:31:   required from ‘void std::set<_Key, _Compare, _Alloc>::insert(_InputIterator, _InputIterator) [with _InputIterator = long long int; _Key = std::pair<long long int, long long int>; _Compare = std::less<std::pair<long long int, long long int> >; _Alloc = std::allocator<std::pair<long long int, long long int> >]’
answer.code:54:38:   required from here
/usr/include/c++/13/bits/stl_tree.h:1100:9: error: no type named ‘value_type’ in ‘struct std::iterator_traits<long long int>’
/usr/include/c++/13/bits/stl_set.h: In instantiation of ‘void std::set<_Key, _Compare, _Alloc>::insert(_InputIterator, _InputIterator) [with _InputIterator = long long int; _Key = std::pair<long long int, long long int>; _Compare = std::less<std::pair<long long int, long long int> >; _Alloc = std::allocator<std::pair<long long int, long long int> >]’:
answer.code:54:38:   required from here
/usr/include/c++/13/bits/stl_tree.h:1109:9: note: candidate: ‘template<class _InputIterator> std::__enable_if_t<(! std::is_same<_Val, typename std::iterator_traits<_InputIterator>::value_type>::value)> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_range_unique(_InputIterator, _InputIterator) [with _Key = std::pair<long long int, long long int>; _Val = std::pair<long long int, long long int>; _KeyOfValue = std::_Identity<std::pair<long long int, long long int> >; _Compare = std::less<std::pair<long long int, long long int> >; _Alloc = std::allocator<std::pair<long long int, long long int> >]’
 1109 |         _M_insert_range_unique(_InputIterator __first, _InputIterator __last)
      |         ^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/stl_tree.h:1109:9: note:   template argument deduction/substitution failed:
/usr/include/c++/13/bits/stl_tree.h: In substitution of ‘template<class _InputIterator> std::__enable_if_t<(! std::is_same<std::pair<long long int, long long int>, typename std::iterator_traits< <template-parameter-1-1> >::value_type>::value), void> std::_Rb_tree<std::pair<long long int, long long int>, std::pair<long long int, long long int>, std::_Identity<std::pair<long long int, long long int> >, std::less<std::pair<long long int, long long int> >, std::allocator<std::pair<long long int, long long int> > >::_M_insert_range_unique(_InputIterator, _InputI...