Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int num;
    while(cin>>num)
    {
        set<string,int> s;
        for(int i=0;i<num;i++)
        {
            string temp;
            cin>>temp;
            s.insert(temp);
        }
        cout<<s.size()<<endl;
    }
}

Compiler output:
In file included from /usr/include/c++/14/map:62,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:152,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_tree.h: In instantiation of 'std::pair<std::_Rb_tree_node_base*, std::_Rb_tree_node_base*> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_get_insert_unique_pos(const key_type&) [with _Key = std::__cxx11::basic_string<char>; _Val = std::__cxx11::basic_string<char>; _KeyOfValue = std::_Identity<std::__cxx11::basic_string<char> >; _Compare = int; _Alloc = std::allocator<std::__cxx11::basic_string<char> >; key_type = std::__cxx11::basic_string<char>]':
/usr/include/c++/14/bits/stl_tree.h:2169:4:   required from 'std::pair<std::_Rb_tree_iterator<_Val>, bool> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_Arg&&) [with _Arg = const std::__cxx11::basic_string<char>&; _Key = std::__cxx11::basic_string<char>; _Val = std::__cxx11::basic_string<char>; _KeyOfValue = std::_Identity<std::__cxx11::basic_string<char> >; _Compare = int; _Alloc = std::allocator<std::__cxx11::basic_string<char> >]'
 2169 |         = _M_get_insert_unique_pos(_KeyOfValue()(__v));
      |           ^~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_set.h:514:25:   required from 'std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Tp>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(const value_type&) [with _Key = std::__cxx11::basic_string<char>; _Compare = int; _Alloc = std::allocator<std::__cxx11::basic_string<char> >; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Tp>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator = std::_Rb_tree<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>, std::_Identity<std::__cxx11::basic_string<char> >, int, std::allocator<std::__cxx11::basic_string<char> > >::const_iterator; typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other = std::allocator<std::__cxx11::basic_string<char> >; typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key> = __gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::rebind<std::__cxx11::basic_string<char> >; typename _Alloc::value_type = std::__cxx11::basic_string<char>; value_type = std::__cxx11::basic_string<char>]'
  514 |           _M_t._M_insert_unique(__x);
      |           ~~~~~~~~~~~~~~~~~~~~~^~~~~
a.cc:13:21:   required from here
   13 |             s.insert(temp);
      |             ~~~~~~~~^~~~~~
/usr/include/c++/14/bits/stl_tree.h:2116:42: error: expression cannot be used as a function
 2116 |           __comp = _M_impl._M_key_compare(__k, _S_key(__x));
      |                    ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_tree.h:2127:33: error: expression cannot be used as a function
 2127 |       if (_M_impl._M_key_compare(_S_key(__j._M_node), __k))
      |           ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_tree.h: In instantiation of 'std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_(_Base_ptr, _Base_ptr, _Arg&&, _NodeGen&) [with _Arg = const std::__cxx11::basic_string<char>&; _NodeGen = std::_Rb_tree<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>, std::_Identity<std::__cxx11::basic_string<char> >, int, std::allocator<std::__cxx11::basic_string<char> > >::_Alloc_node; _Key = std::__cxx11::basic_string<char>; _Val = std::__cxx11::basic_string<char>; _KeyOfValue = std::_Identity<std::__cxx11::basic_string<char> >; _Compare = int; _Alloc = std::allocator<std::__cxx11::basic_string<char> >; iterator = std::_Rb_tree<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>, std::_Identity<std::__cxx11::basic_string<char> >, int, std::allocator<std::__cxx11::basic_string<char> > >::iterator; _Base_ptr = std::_Rb_tree_node_base*]':
/usr/include/c++/14/bits/stl_tree.h:2174:26:   required from 'std::pair<std::_Rb_tree_iterator<_Val>, bool> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_Arg&&) [with _Arg = const std::__cxx11::basic_string<char>&; _Key = std::__cxx11::basic_string<char>; _Val = std::__cxx11::basic_string<char>; _KeyOfValue = std::_Identity<std::__cxx11::basic_string<char> >; _Compare = int; _Alloc = std::allocator<std::__cxx11::basic_string<char> >]'
 2174 |           return _Res(_M_insert_(__res.first, __res.second,
      |                       ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
 2175 |                                  _GLIBCXX_FORWARD(_Arg, __v), __an),
      |                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_set.h:514:25:   required from 'std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Tp>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(const value_type&) [with _Key = std::__cxx11::basic_string<char>; _Compare = int; _Alloc = std::allocator<std::__cxx11::basic_string<char> >; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Tp>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator = std::_Rb_tree<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>, std::_Identity<std::__cxx11::basic_string<char> >, int, std::allocator<std::__cxx11::basic_string<char> > >::const_iterator; typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other = std::allocator<std::__cxx11::basic_string<char> >; typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key> = __gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::rebind<std::__cxx11::basic_string<char> >; typename _Alloc::value_type = std::__cxx11::basic_string<char>; value_type = std::__cxx11::basic_string<char>]'
  514 |           _M_t._M_insert_unique(__x);
      |           ~~~~~~~~~~~~~~~~~~~~~^~~~~
a.cc:13:21:   required from here
   13 |             s.insert(temp);
      |             ~~~~~~~~^~~~~~
/usr/include/c++/14/bits/stl_tree.h:1824:56: error: expression cannot be used as a function
 1824 |                               || _M_impl._M_key_compare(_KeyOfValue()(__v),
      |                                  ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
 1825 |                                                         _S_key(__p)));
      |                                                         ~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_tree.h: In instantiation of 'static const _Key& std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_S_key(_Const_Link_type) [with _Key = std::__cxx11::basic_string<char>; _Val = std::__cxx11::basic_string<char>; _KeyOfValue = std::_Identity<std::__cxx11::basic_string<char> >; _Compare = int; _Alloc = std::allocator<std::__cxx11::basic_string<char> >; _Const_Link_type = const std::_Rb_tree_node<std::__cxx11::basic_string<char> >*]':
/usr/include/c++/14/bits/stl_tree.h:2116:47:   required from 'std::pair<std::_Rb_tree_node_base*, std::_Rb_tree_node_base*> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_get_insert_unique_pos(const key_type&) [with _Key = std::__cxx11::basic_string<char>; _Val = std::__cxx11::basic_string<char>; _KeyOfValue = std::_Identity<std::__cxx11::basic_string<char> >; _Compare = int; _Alloc = std::allocator<std::__cxx11::basic_string<char> >; key_type = std::__cxx11::basic_string<char>]'
 2116 |           __comp = _M_impl._M_key_compare(__k, _S_key(__x));
      |                                                ~~~~~~^~~~~
/usr/include/c++/14/bits/stl_tree.h:2169:4:   required from 'std::pair<std::_Rb_tree_iterator<_Val>, bool> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_Arg&&) [with _Arg = const std::__cxx11::basic_string<char>&; _Key = std::__cxx11::basic_string<char>; _Val = std::__cxx11::basic_string<char>; _KeyOfValue = std::_Identity<std::__cxx11::basic_string<char> >; _Compare = int; _Alloc = std::allocator<std::__cxx11::basic_string<char> >]'
 2169 |         = _M_get_insert_unique_pos(_KeyOfValue()(__v));
      |           ^~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_set.h:514:25:   required from 'std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Tp>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(const value_type&) [with _Key = std::__cxx11::basic_string<char>; _Compare = int; _Alloc = std::allocator<std::__cxx11::basic_string<char> >; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Tp>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator = std::_Rb_tree<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>, std::_Identity<std::__cxx11::basic_string<char> >, int, std::allocator<std::__cxx11::basic_string<char> > >::const_iterator; typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other = std::allocator<std::__cxx11::basic_string<char> >; typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key> = __gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::rebind<std::__cxx11::basic_string<char> >; typename _Alloc::value_type = std::__cxx11::basic_string<char>; value_type = std::__cxx11::basic_string<char>]'
  514 |           _M_t._M_insert_unique(__x);
      |           ~~~~~~~~~~~~~~~~~~~~~^~~~~
a.cc:13:21:   required from here
   13 |             s.insert(temp);
      |             ~~~~~~~~^~~~~~
/usr/include/c++/14/bits/stl_tree.h:760:23: error: static assertion failed: comparison object must be invocable with two arguments of key type
  760 |         static_assert(__is_invocable<_Compare&, const _Key&, const _Key&>{},
      |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_tree.h:760:23: note: 'std::__is_invocable<int&, const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const std::__cxx11::basic_string<char,