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How to Solve Reverse Odd Levels of Binary Tree Problem
Master the Reverse Odd Levels of Binary Tree LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#2415
LeetCode ProblemReverse Odd Levels of Binary Tree
Given the root of a perfect binary tree, reverse the node values at each odd level of the tree. 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.
TreeDepth-First SearchBreadth-First SearchBinary Tree
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Problem Breakdown
Understanding the Reverse Odd Levels of Binary Tree Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given the root of a perfect binary tree, reverse the node values at each odd level of the tree. 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.
MediumProblem #2415
LeetCodeReverse Odd Levels of Binary Tree
Related Topics
TreeDepth-First SearchBreadth-First SearchBinary Tree
How Phantom Code Helps
Get real-time assistance for Reverse Odd Levels of Binary Tree problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
root = [2,3,5,8,13,21,34]
Output
[2,5,3,8,13,21,34]
# Example 2
Input
root = [7,13,11]
Output
[7,11,13]
# Example 3
Input
root = [0,1,2,0,0,0,0,1,1,1,1,2,2,2,2]
Output
[0,2,1,0,0,0,0,2,2,2,2,1,1,1,1]
Constraints
The number of nodes in the tree is in the range [1, 214].
0 <= Node.val <= 105
root is a perfect binary tree.
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Solve Reverse Odd Levels of Binary Tree — Given the root of a perfect binary tree, reverse the node values at each odd lev...
Here's the optimal approach using Tree:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Reverse Odd Levels of Binary Tree and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Reverse Odd Levels of Binary Tree during interviews?
Phantom Code generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.
What if the interviewer asks follow-up questions or modifications to problems like Reverse Odd Levels of Binary Tree?
Phantom Code adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.
Can Phantom Code help me communicate my solution for problems like Reverse Odd Levels of Binary Tree?
Yes. Phantom Code provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.
How does Phantom Code assist with different programming languages for Reverse Odd Levels of Binary Tree type problems?
Phantom Code supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.
What coding mistakes does Phantom Code help me avoid during Reverse Odd Levels of Binary Tree interviews?
Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
Is Phantom Code detectable when solving problems like Reverse Odd Levels of Binary Tree during live interviews?
No. Phantom Code runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.
How does Phantom Code help when I'm struggling with Reverse Odd Levels of Binary Tree style questions under pressure?
The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
Does Phantom Code work for the coding platforms used in Reverse Odd Levels of Binary Tree interviews?
Yes. Phantom Code works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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