/in/foo.cc: In function 'int main()':
/in/foo.cc:11:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |         for(i=0;i<str.length();i++)
      |                 ~^~~~~~~~~~~~~
/in/foo.cc:29:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |         for(i=0;i<str.length();i++)
      |                 ~^~~~~~~~~~~~~