inversion on Binary Tree
Last updated: November 13, 2025
Quick Overview
Perform a partitioning on a binary tree and return the result.
Cockroach Labs
November 13, 20257
14
3,489 solved
Perform a partitioning on a binary tree and return the result.
This coding problem is frequently asked during Take-home Project at Cockroach Labs. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Cockroach Labs expects candidates to write production-quality code, not just solve the puzzle.
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
- What happens if the input contains duplicates?
- Can you optimize the space complexity of your solution?
- Can you solve this in a single pass?
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Practice DSA ProblemsSample Answer
Problem Analysis
The problem of performing a partitioning on a binary tree suggests that we might be looking for a way to traverse and modify the tree structure. Given the context, a Depth-First Search (DFS) approach ...
Approach
- Define Partition Criteria: First, define what it means to 'partition' the binary tree. For example, we could partition based on whether node values are greater than or less than a certain thres...
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