Lintcode70 Binary Tree Level Order Traversal II solution 题解
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【题目描述】
Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root).
给出一棵二叉树,返回其节点值从底向上的层次序遍历(按从叶节点所在层到根节点所在的层遍历,然后逐层从左往右遍历)
【题目链接】
www.lintcode.com/en/problem/binary-tree-level-order-traversal-ii/
【题目解析】
这道题目是相对简单的,只需要计算出从上往下的按层遍历之后,将答案在层的维度上进行翻转即可。
对于答案的翻转,可以直接通过将第1个和最后1个交换,第2个和倒数第2个交换……来完成
【参考答案】
www.jiuzhang.com/solutions/binary-tree-level-order-traversal-ii/
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