/in/foo.cc: In function 'int main()':
/in/foo.cc:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 1; i < nums.size(); i++) {
                     ~~^~~~~~~~~~~~~
/in/foo.cc:20:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (pos == f.size())
             ~~~~^~~~~~~~~~~