/in/foo.cc: In function 'int main()':
/in/foo.cc:35:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0; i<ans.size(); i++)
                ~^~~~~~~~~~~
/in/foo.cc:38:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       if(i!=ans.size()-1)cout<<" ";
          ~^~~~~~~~~~~~~~
/in/foo.cc:40:11: error: expected '}' at end of input
   return 0;
           ^