【简答题】(6)二叉树的基本组成部分是:根(D)、左子树(L)和右子树(R)。因而二叉树的遍历次序有六种。最常用的是三种:前序法(即按N L R次序),后序法(即按__________次序)和中序法(也称对称序法,即按L N R次序)。这三种方法相互之间有关联。若已知一棵二叉树的前序序列是BEFCGDH,中序序列是FEBGCHD,则它的后序序列必是__________。
【简答题】二叉树的基本组成部分是:根( N )、左子树( L )和右子树( R )。因而二叉树的遍历次序有六种。最常用的是三种:前序法(即按 N L R 次序),后序法(即按 L R N 次序)和中序法(也称对称序法,即按 L N R 次序)。这三种方法相互之间有关联。若已知一棵二叉树的前序序列是 BEFCGDH ,中序序列是 FEBGCHD ,则它的后序序列必是 。
【单选题】Questions 下列各are based on the following passage. There was a time not long ago when new science Ph. D. s in the United States were expected topursue a career path in academ/a (学术界).But today, most gra...
A.
They lack the skills and expertise needed for their jobs.
B.
They can choose from a wider range of well-paying jobs.
C.
They often have to seek jobs outside the academic circle.
D.
They are regarded as the nations driving force of change.