/in/foo.cc: In function 'int main()':
/in/foo.cc:8:22: 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 i=2;i<=s.size(); i++)
      |                     ~^~~~~~~~~~
/in/foo.cc:10:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |                 for(int j=0; j<=s.size()-i; i++)
      |                              ~^~~~~~~~~~~~