foo.cc: In function ‘void dfs(int)’:
foo.cc:26:15: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   26 |         if(dep==s.size()+1)
      |            ~~~^~~~~~~~~~~~
foo.cc: In function ‘int main()’:
foo.cc:50:30: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   50 |                 for(int i=0;i<s.size();i++)
      |                             ~^~~~~~~~~