单项选择题
A.6,8,10,11 B.6,9,10,11 C.6,7,9,11 D.6,8,9,11
A.二叉排序树 B.大顶堆 C.小顶堆 D.平衡二叉树
A.(10,50,80,30,60,20,15,18) B.(10,18,15,20,50,80,30,60) C.(10,15,18,50,80,30,60,20) D.(10,30,60,20,15,18,50,80)