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In file included from prog_joined.cpp:1:
In file included from /leetcode/precompiled/headers.h:34:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/algorithm:74:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/pstl/glue_algorithm_defs.h:13:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/functional:54:
/usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/tuple:1820:2: error: no matching constructor for initialization of 'User'
 1815 |         second(std::forward<_Args2>(std::get<_Indexes2>(__tuple2))...)
      |         ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/tuple:1807:9: note: in instantiation of function template specialization 'std::pair<const int, User>::pair<const int &, 0UL>' requested here
 1802 |       : pair(__first, __second,
      |         ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/stl_construct.h:97:39: note: in instantiation of function template specialization 'std::pair<const int, User>::pair<const int &>' requested here
   92 |     { return ::new((void*)__location) _Tp(std::forward<_Args>(__args)...); }
      |                                       ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/alloc_traits.h:518:9: note: in instantiation of function template specialization 'std::construct_at<std::pair<const int, User>, const std::piecewise_construct_t &, std::tuple<const int &>, std::tuple<>>' requested here
  513 |           std::construct_at(__p, std::forward<_Args>(__args)...);
      |                ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/hashtable_policy.h:1878:27: note: in instantiation of function template specialization 'std::allocator_traits<std::allocator<std::__detail::_Hash_node<std::pair<const int, User>, false>>>::construct<std::pair<const int, User>, const std::piecewise_construct_t &, std::tuple<const int &>, std::tuple<>>' requested here
 1873 |             __node_alloc_traits::construct(_M_node_allocator(),
      |                                  ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/hashtable.h:304:19: note: in instantiation of function template specialization 'std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<const int, User>, false>>>::_M_allocate_node<const std::piecewise_construct_t &, std::tuple<const int &>, std::tuple<>>' requested here
  299 |             _M_node(__h->_M_allocate_node(std::forward<_Args>(__args)...))
      |                          ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/hashtable_policy.h:707:42: note: in instantiation of function template specialization 'std::_Hashtable<int, std::pair<const int, User>, std::allocator<std::pair<const int, User>>, std::__detail::_Select1st, std::equal_to<int>, std::hash<int>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>>::_Scoped_node::_Scoped_node<const std::piecewise_construct_t &, std::tuple<const int &>, std::tuple<>>' requested here
  702 |       typename __hashtable::_Scoped_node __node {
      |                                          ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/unordered_map.h:980:16: note: in instantiation of member function 'std::__detail::_Map_base<int, std::pair<const int, User>, std::allocator<std::pair<const int, User>>, std::__detail::_Select1st, std::equal_to<int>, std::hash<int>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>>::operator[]' requested here
  975 |       { return _M_h[__k]; }
      |                ^
Line 53: Char 12: note: in instantiation of member function 'std::unordered_map<int, User>::operator[]' requested here
   53 |         map[selfId] = u;
      |            ^
Line 15: Char 5: note: candidate constructor not viable: requires single argument 'userId', but no arguments were provided
   15 |     User(int userId): user_id(userId){}
      |     ^    ~~~~~~~~~~
Line 10: Char 7: note: candidate constructor (the implicit copy constructor) not viable: requires 1 argument, but 0 were provided
   10 | class User {
      |       ^~~~
Line 10: Char 7: note: candidate constructor (the implicit move constructor) not viable: requires 1 argument, but 0 were provided
   10 | class User {
      |       ^~~~
1 error generated.