foo.cc: In function ‘int main()’:
foo.cc:5:9: error: ‘cin’ was not declared in this scope
    5 |         cin>>n>>k;
      |         ^~~
foo.cc:2:1: note: ‘std::cin’ is defined in header ‘<iostream>’; did you forget to ‘#include <iostream>’?
    1 | #include<stdio.h>
  +++ |+#include <iostream>
    2 | using namespace std;
foo.cc:5:14: error: ‘n’ was not declared in this scope
    5 |         cin>>n>>k;
      |              ^
foo.cc:5:17: error: ‘k’ was not declared in this scope
    5 |         cin>>n>>k;
      |                 ^
foo.cc:6:9: error: ‘cout’ was not declared in this scope
    6 |         cout<<n+k;
      |         ^~~~
foo.cc:6:9: note: ‘std::cout’ is defined in header ‘<iostream>’; did you forget to ‘#include <iostream>’?

Found 3 testcases.