A.51 B.23 C.53 D.74
A.3 B.4 C.5 D.6
A.每個(gè)結(jié)點(diǎn)至多有兩棵子樹(shù)的樹(shù) B.哈夫曼樹(shù) C.每個(gè)結(jié)點(diǎn)至多有兩棵子樹(shù)的有序樹(shù) D.每個(gè)結(jié)點(diǎn)只有一棵子樹(shù)