/in/foo.cc:4:0: warning: ignoring #pragma warning  [-Wunknown-pragmas]
 #pragma warning(disable:4996)
 
/in/foo.cc: In function 'int main()':
/in/foo.cc:23:28: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::set<int>::size_type {aka long unsigned int}' [-Wformat=]
  printf("%d\n", num2.size());
                            ^