/in/foo.cc: In function 'int main()':
/in/foo.cc:17:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |                 for(int i=0;i<a.size();i++)
      |                             ~^~~~~~~~~
/in/foo.cc:30:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |                         for(int i=0;i<a.size();i++)
      |                                     ~^~~~~~~~~