/in/foo.cc: In function 'int main()':
/in/foo.cc:10:23: 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();i++)
      |                      ~^~~~~~~~~
/in/foo.cc:15:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |                 for (int i=0;i<v.size();i++)
      |                              ~^~~~~~~~~
/in/foo.cc:28:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |         for (int i=0;i<v.size();i++)
      |                      ~^~~~~~~~~