Day7 Binary Tree Level Order Traversal II
2018-02-05 18:45
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LeetCode107. Binary Tree Level Order Traversal II
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).
For example:
Given binary tree
return its bottom-up level order traversal as:
比较理想的是按照层序把数字依次放进ans数组中,要层序遍历的话,需用到队列。
值得注意的是,应该让每次循环后,队列里都只留下二叉树的一整层。
全部放进数组后整个倒置一遍就ok了。
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).
For example:
Given binary tree
[3,9,20,null,null,15,7],
3 / \ 9 20 / \ 15 7
return its bottom-up level order traversal as:
[ [15,7], [9,20], [3] ]
比较理想的是按照层序把数字依次放进ans数组中,要层序遍历的话,需用到队列。
值得注意的是,应该让每次循环后,队列里都只留下二叉树的一整层。
全部放进数组后整个倒置一遍就ok了。
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