Class Solution
java.lang.Object
g0101_0200.s0107_binary_tree_level_order_traversal_ii.Solution
public class Solution
extends java.lang.Object
107 - Binary Tree Level Order Traversal II.
Medium
Given the root
of a binary tree, return the bottom-up level order traversal of its nodes’ values. (i.e., from left to right, level by level from leaf to root).
Example 1:
Input: root = [3,9,20,null,null,15,7]
Output: [[15,7],[9,20],[3]]
Example 2:
Input: root = [1]
Output: 1
Example 3:
Input: root = []
Output: []
Constraints:
- The number of nodes in the tree is in the range
[0, 2000]
. -1000 <= Node.val <= 1000
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionvoid
java.util.List
<java.util.List<java.lang.Integer>> levelOrderBottom
(TreeNode root) Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Constructor Details
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Solution
public Solution()
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Method Details
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levelOrderBottom
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getOrder
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