Binary Tree Level Order Traversal II
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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,#,#,15,7},
3
/ \
9 20
/ \
15 7
return its bottom-up level order traversal as:
[
[15,7]
[9,20],
[3],
]
题意:倒序输出层序遍历。
0 0
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