/in/foo.cc: In function 'std::string Jia(const string&, const string&)':
/in/foo.cc:22:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     while (i < Outstr.size() || i < s.size() || carry > 0) {
      |            ~~^~~~~~~~~~~~~~~
/in/foo.cc:22:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     while (i < Outstr.size() || i < s.size() || carry > 0) {
      |                                 ~~^~~~~~~~~~
/in/foo.cc:23:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         int num1 = (i < Outstr.size()) ? (Outstr[i] - '0') : 0;
      |                     ~~^~~~~~~~~~~~~~~
/in/foo.cc:24:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |         int num2 = (i < s.size()) ? (s[i] - '0') : 0;
      |                     ~~^~~~~~~~~~