# 比较两个单词的先后,如果 word1 在 word2 前面则返回 True, 否则返回 False def cmp(word1, word2): if not word1: return True elif not word2: return False if word1[0] == word2[0]: w1, w2 = word1[1:], word2[1:] tag = cmp(w1, w2) return tag elif word1[0] < word2[0]: ...