/in/foo.cc: In function 'int main()':
/in/foo.cc:16:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < t.size(); i++) printf("%d ", t[i]);
                  ~~^~~~~~~~~~
/in/foo.cc:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < s.size(); i++) printf("%d ", s[i]);
                  ~~^~~~~~~~~~