/in/foo.cc: In function 'int main()':
/in/foo.cc:52:34: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
  printf("%d %d\n",ans,ansk.size());
                       ~~~~~~~~~~~^
/in/foo.cc:53:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<ansk.size();i++) printf("%d ",ansk[i]);
              ~^~~~~~~~~~~~