/in/foo.cc: In function 'int main()':
/in/foo.cc:5:9: error: 'cin' was not declared in this scope
    5 |         cin>>n;
      |         ^~~
/in/foo.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
  +++ |+#include <iostream>
    1 | using namespace std;
/in/foo.cc:9:9: error: 'cout' was not declared in this scope
    9 |         cout<<"1"<<" "<<"1";
      |         ^~~~
/in/foo.cc:9:9: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?