foo.cc: In function ‘int main()’:
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 i=0;i<s.size()-2;i++)cout <<s[i];
      |                              ~^~~~~~~~~~~
foo.cc:12:31: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   12 |                 for (int i=0;i<s.size()-3;i++)cout <<s[i];
      |                              ~^~~~~~~~~~~