Language: C++

#include<bits/stdc++.h>

int main(){
　int N,M;
  int cnt1 = 0;
  int cnt2 = 0;
  string U[256];
  string T[256];
  cin>>N;
  for(int i=0;i<N;i++) cin>>U[i];
  cin>>M;
  for(int j=0;j<M;j++) cin>>T[j];
  for(int j=0;j<M;j++){
  for(int i=0;i<N;i++){
 if(T[j] == U[i]) cnt1++;
 else cnt2++;
 }
if(cnt1 % 2 == 1 && cnt2 != N) cout<<"Opened by"<<" "<<T[j]<<endl;
if(cnt2 % 2 == 0 && cnt2 != N) cout<<"Closed by"<<" "<<T[j]<<endl;
if(cnt2 == N) cout<<"Unknown"<<" "<<T[j]<<endl;
cnt2 = 0;
}
 return 0;
}



Compiler output:
a.cc:4:1: error: extended character 　 is not valid in an identifier
    4 | 　int N,M;
      | ^
a.cc: In function 'int main()':
a.cc:4:1: error: '\U00003000int' was not declared in this scope
    4 | 　int N,M;
      | ^~~~~
a.cc:7:3: error: 'string' was not declared in this scope
    7 |   string U[256];
      |   ^~~~~~
a.cc:7:3: 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,
                 from a.cc:1:
/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:8:9: error: expected ';' before 'T'
    8 |   string T[256];
      |         ^~
      |         ;
a.cc:9:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    9 |   cin>>N;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:9:8: error: 'N' was not declared in this scope
    9 |   cin>>N;
      |        ^
a.cc:10:29: error: 'U' was not declared in this scope
   10 |   for(int i=0;i<N;i++) cin>>U[i];
      |                             ^
a.cc:11:8: error: 'M' was not declared in this scope
   11 |   cin>>M;
      |        ^
a.cc:12:29: error: 'T' was not declared in this scope
   12 |   for(int j=0;j<M;j++) cin>>T[j];
      |                             ^
a.cc:15:5: error: 'T' was not declared in this scope
   15 |  if(T[j] == U[i]) cnt1++;
      |     ^
a.cc:15:13: error: 'U' was not declared in this scope
   15 |  if(T[j] == U[i]) cnt1++;
      |             ^
a.cc:18:32: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   18 | if(cnt1 % 2 == 1 && cnt2 != N) cout<<"Opened by"<<" "<<T[j]<<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:18:56: error: 'T' was not declared in this scope
   18 | if(cnt1 % 2 == 1 && cnt2 != N) cout<<"Opened by"<<" "<<T[j]<<endl;
      |                                                        ^
a.cc:18:62: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   18 | if(cnt1 % 2 == 1 && cnt2 != N) cout<<"Opened by"<<" "<<T[j]<<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)
      |     ^~~~
a.cc:19:32: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   19 | if(cnt2 % 2 == 0 && cnt2 != N) cout<<"Closed by"<<" "<<T[j]<<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:19:56: error: 'T' was not declared in this scope
   19 | if(cnt2 % 2 == 0 && cnt2 != N) cout<<"Closed by"<<" "<<T[j]<<endl;
      |                                                        ^
a.cc:19:62: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   19 | if(cnt2 % 2 == 0 && cnt2 != N) cout<<"Closed by"<<" "<<T[j]<<endl;
      |                                                              ^~~~
      |                                                              std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:20:15: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   20 | if(cnt2 == N) cout<<"Unknown"<<" "<<T[j]<<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:20:37: error: 'T' was not declared in this scope
   20 | if(cnt2 == N) cout<<"Unknown"<<" "<<T[j]<<endl;
      |                                     ^
a.cc:20:43: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   20 | if(cnt2 == N) cout<<"Unknown"<<" "<<T[j]<<endl;
      |                                           ^~~~
      |                                           std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~