运行 ID: 76733

Main.cc: In function ‘int main()’:
Main.cc:5:2: error: ‘cin’ was not declared in this scope
  cin>>n; 
  ^~~
Main.cc:5:2: note: suggested alternative: ‘main’
  cin>>n; 
  ^~~
  main
Main.cc:8:3: error: ‘cout’ was not declared in this scope
   cout<<"yes";
   ^~~~
Main.cc:12:3: error: ‘cout’ was not declared in this scope
   cout<<""; 
   ^~~~