rotation on Binary Tree
Last updated: March 19, 2026
Quick Overview
Given a binary tree, perform a rotation operation on the tree at a specified node and return the new root of the tree. The rotation can be either left or right, depending on the input parameter. Ensure that the tree maintains its binary search tree properties after the rotation.
Salesforce
March 19, 20261
5
3,187 solved
Given a binary tree, perform a rotation operation on the tree at a specified node and return the new root of the tree. The rotation can be either left or right, depending on the input parameter. Ensure that the tree maintains its binary search tree properties after the rotation.
Coding interviews at Salesforce 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?
- How would your solution change if the input was sorted?
- How would you parallelize this solution?
- What if the input doesn't fit in memory?
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Practice DSA ProblemsSample Answer
Problem Analysis
The problem requires us to perform a rotation operation on a binary tree at a specific node. This can be classified under tree operations, specifically focusing on binary search trees (BST). The key o...
Approach
- Identify the Node: Start by locating the node at which the rotation needs to occur. This can be done using a simple traversal.
- Perform Rotation: Depending on whether a left or right ro...
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