/in/foo.cc: In function 'void Output()':
/in/foo.cc:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < all_num.size(); i++) {
                  ~~^~~~~~~~~~~~~~~~
/in/foo.cc: In function 'void Digui()':
/in/foo.cc:141:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int j = 0; j < tem_allone.size(); j++) {
                   ~~^~~~~~~~~~~~~~~~~~~