rotation on Binary Tree
Last updated: May 17, 2026
Quick Overview
Perform a rotation on a binary tree and return the result.
Visa
Coding & Algorithms
Software Engineer
Visa
May 17, 2026Software Engineer
Technical Screen
Coding & Algorithms
Medium
107
10
1,361 solved
Perform a rotation on a binary tree and return the result.
Coding interviews at Visa 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
Common algorithm patterns (sliding window, two pointers, BFS/DFS)
Hash maps and frequency counting
Binary search and divide and conquer
Sorting and searching
Dynamic programming and memoization
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 if the input doesn't fit in memory?
- Can you solve this iteratively instead of recursively (or vice versa)?
- What happens if the input contains duplicates?
- How would you modify your solution to handle streaming input?
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Practice DSA ProblemsSample Answer
Problem Analysis
To rotate a binary tree, we need to understand the tree structure and the concept of rotation. A rotation can be thought of as transforming the tree in a way that changes the hierarchy of nodes withou...
Approach
- Define a recursive function
rotate_tree(node, rotation_type)whererotation_typedetermines the type of rotation (e.g., left or right). - If the current node is
None, returnNone. - I...
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