foo.cc: In function 'int main()':
foo.cc:10:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |  for (int i = 0; i < s.length(); i++) {
      |                  ~~^~~~~~~~~~~~
foo.cc:34:11: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   34 |   cout << x;
      |           ^

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