Language: C++

#include<bits/stdc++.h>
using namespace tsd;
int main(){
  int N;
  cin>>N;
  map<string,int> data;
  for(int i=0;i<N;i++){
    string tmp;
    data[tmp]++;
  }
  cout<<data.size()<<endl;
}

Compiler output:
a.cc:2:17: error: 'tsd' is not a namespace-name
    2 | using namespace tsd;
      |                 ^~~
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin>>N;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:3: error: 'map' was not declared in this scope
    6 |   map<string,int> data;
      |   ^~~
a.cc:6:3: note: suggested alternatives:
In file included from /usr/include/c++/14/map:63,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:152:
/usr/include/c++/14/bits/stl_map.h:102:11: note:   'std::map'
  102 |     class map
      |           ^~~
/usr/include/c++/14/map:89:13: note:   'std::pmr::map'
   89 |       using map
      |             ^~~
a.cc:6:7: error: 'string' was not declared in this scope
    6 |   map<string,int> data;
      |       ^~~~~~
a.cc:6:7: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:6:14: error: expected primary-expression before 'int'
    6 |   map<string,int> data;
      |              ^~~
a.cc:8:11: error: expected ';' before 'tmp'
    8 |     string tmp;
      |           ^~~~
      |           ;
a.cc:9:5: error: 'data' was not declared in this scope; did you mean 'std::data'?
    9 |     data[tmp]++;
      |     ^~~~
      |     std::data
In file included from /usr/include/c++/14/string:53:
/usr/include/c++/14/bits/range_access.h:344:5: note: 'std::data' declared here
  344 |     data(initializer_list<_Tp> __il) noexcept
      |     ^~~~
a.cc:9:10: error: 'tmp' was not declared in this scope; did you mean 'tm'?
    9 |     data[tmp]++;
      |          ^~~
      |          tm
a.cc:11:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   11 |   cout<<data.size()<<endl;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:11:9: error: 'data' was not declared in this scope; did you mean 'std::data'?
   11 |   cout<<data.size()<<endl;
      |         ^~~~
      |         std::data
/usr/include/c++/14/bits/range_access.h:344:5: note: 'std::data' declared here
  344 |     data(initializer_list<_Tp> __il) noexcept
      |     ^~~~
a.cc:11:22: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   11 |   cout<<data.size()<<endl;
      |                      ^~~~
      |                      std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~