/in/foo.cc: In function 'int main()':
/in/foo.cc:8:32: error: 'scanf_s' was not declared in this scope
  scanf_s("%d %d %d", &v, &n, &c);
                                ^
/in/foo.cc:7:6: warning: unused variable 'b' [-Wunused-variable]
  int b;
      ^