/in/foo.cc: In function 'void Start()':
/in/foo.cc:39:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(register int i=0;i<can.size();i++)
                              ~^~~~~~~~~~~
/in/foo.cc:40:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(register int j=0;j<no.size();j++)
                                  ~^~~~~~~~~~