第3章提出按层推进方法和背后原理对aft方法进行改进和控制。
In chapter 3, the advancing - by - layer method and the backward principle are proposed to improve and control AFT.
第3章提出按层推进方法和背后原理对aft方法进行改进和控制。
In chapter3, the advancing-by-layer method and the backward principle are proposed to improve and control AFT.
给定一个二叉树序列，你要写一个程序将每棵树按层序访问并打印出来。
Given a sequence of binary trees, you are to write a program that prints a level-order traversal of each tree.
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