How to Solve Reverse Odd Levels of Binary Tree Problem
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Reverse Odd Levels of Binary Tree
Given the root of a perfect binary tree, reverse the node values at each odd level of the tree. For example, suppose the node values at level 3 are [2,1,3,4,7,11,29,18], then it should become [18,29,1...
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Understanding the Reverse Odd Levels of Binary Tree Problem
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Problem Statement
Given the root of a perfect binary tree, reverse the node values at each odd level of the tree. For example, suppose the node values at level 3 are [2,1,3,4,7,11,29,18], then it should become [18,29,11,7,4,3,1,2]. Return the root of the reversed tree. A binary tree is perfect if all parent nodes have two children and all leaves are on the same level. The level of a node is the number of edges along the path between it and the root node.
Reverse Odd Levels of Binary Tree
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Examples
root = [2,3,5,8,13,21,34][2,5,3,8,13,21,34]The tree has only one odd level. The nodes at level 1 are 3, 5 respectively, which are reversed and become 5, 3.
root = [7,13,11][7,11,13]The nodes at level 1 are 13, 11, which are reversed and become 11, 13.
root = [0,1,2,0,0,0,0,1,1,1,1,2,2,2,2][0,2,1,0,0,0,0,2,2,2,2,1,1,1,1]The odd levels have non-zero values. The nodes at level 1 were 1, 2, and are 2, 1 after the reversal. The nodes at level 3 were 1, 1, 1, 1, 2, 2, 2, 2, and are 2, 2, 2, 2, 1, 1, 1, 1 after the reversal.
Constraints
The number of nodes in the tree is in the range [1, 214].0 <= Node.val <= 105root is a perfect binary tree.How Interview Coder Helps with Leetcode Problems
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