Package g0101_0200.s0107_binary_tree_level_order_traversal_ii

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    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

    • Nested Class Summary

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      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description