Run id: 143405

Main.cc: In function 'int main()':
Main.cc:7:5: error: 'cin' was not declared in this scope
     cin>>n;
     ^
Main.cc:21:9: error: 'cout' was not declared in this scope
         cout<<-1;
         ^
Main.cc:30:1: error: 'cout' was not declared in this scope
 cout<