/in/foo.cc: In function 'int main()':
/in/foo.cc:5:1: error: 'cin' was not declared in this scope
 cin>>n;
 ^~~
/in/foo.cc:5:1: note: suggested alternative:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:75:0,
                 from /in/foo.cc:1:
/usr/include/c++/6/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^~~
/in/foo.cc:9:1: error: 'cout' was not declared in this scope
 cout<<sum;
 ^~~~
/in/foo.cc:9:1: note: suggested alternative:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:75:0,
                 from /in/foo.cc:1:
/usr/include/c++/6/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~