/in/foo.cc: In function 'int main()':
/in/foo.cc:71:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<ans.size();i++)
                 ~^~~~~~~~~~~
/in/foo.cc:73:51: warning: format '%d' expects argument of type 'int', but argument 2 has type '__gnu_cxx::__alloc_traits<std::allocator<long long int> >::value_type {aka long long int}' [-Wformat=]
         if(ans[i]!=ans[i-1])printf("%.9d\n",ans[i]);
                                                   ^