/in/foo.cc: In function 'int main()':
/in/foo.cc:27:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |   for(int i=0;i<s.size();i++)
      |               ~^~~~~~~~~
/in/foo.cc:61:4: warning: label 'defult' defined but not used [-Wunused-label]
   61 |    defult:
      |    ^~~~~~