partitioning on Binary Tree
Last updated: June 3, 2026
Quick Overview
Perform a traversal on a binary tree and return the result.
Vercel
June 3, 202636
12
3,087 solved
Perform a traversal on a binary tree and return the result.
Coding interviews at Vercel 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
- Can you optimize the space complexity of your solution?
- Can you solve this iteratively instead of recursively (or vice versa)?
- What happens if the input contains duplicates?
- Can you solve this in a single pass?
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Practice DSA ProblemsSample Answer
Problem Analysis
To solve the problem of traversing a binary tree and returning the results, we can identify that this problem fits a Depth First Search (DFS) pattern. DFS is appropriate here because it allows us ...
Approach
We can perform a DFS traversal using a recursive function. The algorithm will proceed as follows:
- Start at the root node.
- Check if the current node is null. If it is, return an empty list (base...
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