运行 ID: 6273

Main.cc: In function ‘int main()’:
Main.cc:5:3: error: ‘cin’ was not declared in this scope
   cin>>a;
   ^~~
Main.cc:5:3: note: suggested alternative: ‘main’
   cin>>a;
   ^~~
   main
Main.cc:8:4: error: ‘cout’ was not declared in this scope
    cout<<-i;
    ^~~~
Main.cc:16:2: error: ‘cout’ was not declared in this scope
  cout<