Language: C++

#include<bits/stdc++.h>

int main(){
　int N,M;
  int cnt1 = 0;
  int cnt2 = 0;
  int U[256];
  int 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: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,
                 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:9:8: error: 'N' was not declared in this scope
    9 |   cin>>N;
      |        ^
a.cc:11:8: error: 'M' was not declared in this scope
   11 |   cin>>M;
      |        ^
a.cc:18:34: 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:18:64: 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:19:34: 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:19:64: 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:20:17: 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:20:45: 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)
      |     ^~~~