/in/foo.cc: In function 'int Dd(std::__cxx11::string&, int, int)':
/in/foo.cc:9:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.length();i++)
              ~^~~~~~~~~~~
/in/foo.cc:20:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(i<s.length() && s[i]!=' ') i++;
         ~^~~~~~~~~~~