flattening on Binary Tree
Last updated: July 5, 2025
Quick Overview
Perform a partitioning on a binary tree and return the result.
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July 5, 202510
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Perform a partitioning on a binary tree and return the result.
This coding problem is frequently asked during Onsite at Zoom. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Zoom expects candidates to write production-quality code, not just solve the puzzle.
What the Interviewer Expects
- Identify the correct data structure and algorithm for the problem
- Write clean, bug-free code with proper variable naming
- Analyze time and space complexity correctly
- Handle basic edge cases (empty input, single element)
- Communicate your thought process while coding
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 your solution change if the input was sorted?
- How would you modify your solution to handle streaming input?
- How would you test this solution thoroughly?
- Can you solve this in a single pass?
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Practice DSA ProblemsSample Answer
Problem Analysis
In this problem, we need to flatten a binary tree into a linked list in-place. The key pattern that applies here is a Depth-First Search (DFS) traversal, specifically using recursion to visit each nod...
Approach
- Base Case: If the current node is null, return immediately. This handles the case where we've reached a leaf's child.
- Recursion: Recursively flatten the left and right subtrees of the cu...
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