Optimize traversal for with follow-up
Last updated: April 20, 2026
Quick Overview
Given a binary tree, implement an optimized traversal method that allows for efficient retrieval of node values in a specified order. Your solution should handle follow-up queries that require accessing nodes based on their traversal indices. The input will be the root of the binary tree, and the output should be a list of node values in the requested traversal order.
Adobe
April 20, 202677
11
748 solved
Given a binary tree, implement an optimized traversal method that allows for efficient retrieval of node values in a specified order. Your solution should handle follow-up queries that require accessing nodes based on their traversal indices. The input will be the root of the binary tree, and the output should be a list of node values in the requested traversal order.
Coding interviews at Adobe focus on problem-solving approach as much as the final solution. The interviewer wants to see you break down the problem, consider edge cases, and optimize iteratively. Communication throughout the process is key.
What the Interviewer Expects
- Recognize the underlying problem pattern (sliding window, two pointers, BFS/DFS, etc.)
- Discuss multiple approaches and trade-offs before coding
- Implement an optimal solution with clean, production-quality code
- Handle all edge cases including boundary conditions and invalid input
- Optimize both time and space complexity with clear justification
- Test your solution systematically with well-chosen examples
Key Topics to Cover
How to Approach This
- Clarify input constraints and edge cases before writing code.
- Walk through your approach verbally and confirm with the interviewer before coding.
- Start with a brute force solution, then optimize. Mention time and space complexity.
- Test your solution with examples, including edge cases like empty input or duplicates.
- Consider common patterns: sliding window, two pointers, hash map, BFS/DFS, dynamic programming.
Possible Follow-up Questions
- How would you modify your solution to handle streaming input?
- How would you parallelize this solution?
- Can you optimize the space complexity of your solution?
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Practice DSA ProblemsSample Answer
Problem Analysis
The problem requires us to traverse a binary tree in a specified order and efficiently retrieve node values based on traversal indices. This suggests a Depth-First Search (DFS) approach, as it all...
Approach
We will implement a DFS traversal to collect node values in a specified order. Here’s the step-by-step algorithm:
- Define a recursive function that takes the current node and a list to hold the resu...
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