/in/foo.cc: In function 'std::string jz(int)':
/in/foo.cc:14:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     while(pos<ret.size()&&ret[pos]=='0') pos++;
      |           ~~~^~~~~~~~~~~
/in/foo.cc:15:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |     if(pos==ret.size()) return "0";
      |        ~~~^~~~~~~~~~~~