partitioning on Binary Tree
Last updated: May 23, 2026
Quick Overview
Perform a traversal on a binary tree and return the result.
Slack
Coding & Algorithms
Software Engineer
Slack
May 23, 2026Software Engineer
Onsite
Coding & Algorithms
Medium
463
9
2,314 solved
Perform a traversal on a binary tree and return the result.
Slack uses this problem in the Onsite to evaluate your algorithmic thinking. They expect you to discuss multiple approaches, analyze trade-offs between them, and implement the optimal solution with clean, readable code.
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
Common algorithm patterns (sliding window, two pointers, BFS/DFS)
Sorting and searching
Tree structures and recursion
Binary search and divide and conquer
Hash maps and frequency counting
Edge cases and input validation
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 your solution change if the input was sorted?
- Can you solve this iteratively instead of recursively (or vice versa)?
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Practice DSA ProblemsSample Answer
Problem Analysis
In this problem, we need to traverse a binary tree and return the result of that traversal. The most common traversal methods are Depth-First Search (DFS) and Breadth-First Search (BFS). Given the nat...
Approach
- Choose a Traversal Type: Let's go with Inorder traversal (left, root, right) for this example. This is a common way to traverse binary trees and will yield sorted order for binary search trees....
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