/in/foo.cc: In function 'int main()':
/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 |     for(int i=0;i<s.size();i++){
      |                 ~^~~~~~~~~