partitioning on Binary Tree
Last updated: December 24, 2025
Quick Overview
Perform a inversion on a binary tree and return the result.
Mastercard
Coding & Algorithms
Software Engineer
Mastercard
December 24, 2025Software Engineer
Onsite
Coding & Algorithms
Easy
8
6
2,099 solved
Perform a inversion on a binary tree and return the result.
Coding interviews at Mastercard 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
- 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
Hash maps and frequency counting
Dynamic programming and memoization
Binary search and divide and conquer
Time and space complexity analysis
Sorting and searching
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 parallelize this solution?
- How would your solution change if the input was sorted?
- Can you solve this in a single pass?
- What happens if the input contains duplicates?
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Practice DSA ProblemsSample Answer
Problem Analysis
The problem requires us to perform an inversion on a binary tree. This implies that we need to swap the left and right children of every node in the tree. The pattern that fits here is a tree traversa...
Approach
- Define the function: We will create a function
invert_tree(root)that takes the root of the binary tree as input. - Base case: If the
rootisNone, returnNone. This handles the ed...
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