/in/foo.cc: In function 'void putstr(std::string)':
/in/foo.cc:23:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         for(int i=0;i<s.size();i++)putchar(s[i]);
      |                     ~^~~~~~~~~