运行 ID: 42484

Main.cc: In function ‘int main()’:
Main.cc:3:5: error: ‘cin’ was not declared in this scope
     cin>>n;
     ^~~
Main.cc:3:5: note: suggested alternative: ‘main’
     cin>>n;
     ^~~
     main
Main.cc:13:2: error: ‘cout’ was not declared in this scope
  cout<