/in/foo.cc: In function 'std::string erjz(int)':
/in/foo.cc:15:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |         while(pos<ret.size()&&ret[pos]=='0') pos++;
      |               ~~~^~~~~~~~~~~
/in/foo.cc:16:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |         if(pos==ret.size()) return "0";
      |            ~~~^~~~~~~~~~~~