结点的层次、树的深度 A 第一层 B C 第二层 )GH ①① 第三 层 K 第四层 树的深度为4 Data structure LriData Structure LXJ 结点的层次、树的深度 树的深度为4 A B C D E F G H I J K L M ··········································· ··第一层 ······························ 第二层 ···············第三 层 ···································· 第四层