/in/foo.cc: In function 'int main()':
/in/foo.cc:48:10: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
      pos = j;
      ~~~~^~~
/in/foo.cc:57:24: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
     output+=address[pos];
                        ^