/in/foo.cc: In function 'void slower(std::__cxx11::string&)':
/in/foo.cc:8:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < s.size(); i++) {
                   ~~^~~~~~~~~~
/in/foo.cc: In function 'void solve()':
/in/foo.cc:15:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < ss.size(); i++) {
                   ~~^~~~~~~~~~~
/in/foo.cc:18:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (pos == s.size() - 1) {
             ~~~~^~~~~~~~~~~~~~~