/in/foo.cc: In function 'int main()':
/in/foo.cc:11:15: error: 'cin' was not declared in this scope
     int n, k; cin >> n >> k;
               ^~~
/in/foo.cc:15:38: error: 'min' was not declared in this scope
         for (int j = 2; j <= min(i, k); j ++) {
                                      ^
/in/foo.cc:19:5: error: 'cout' was not declared in this scope
     cout << ans[n][k] << endl;
     ^~~~
/in/foo.cc:19:26: error: 'endl' was not declared in this scope
     cout << ans[n][k] << endl;
                          ^~~~