/in/foo.cc: In function 'int main()':
/in/foo.cc:7:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |         for(int i=2;i<=s.size();i++){
      |                     ~^~~~~~~~~~
/in/foo.cc:8:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |                 for(int j=0;j<=s.size()-i;j++){
      |                             ~^~~~~~~~~~~~