Merge Three Sorted matrixs
Last updated: April 11, 2026
Quick Overview
Given two sorted graphs, merge them into a single sorted result.
HRT
April 11, 202646
4
992 solved
Given two sorted graphs, merge them into a single sorted result.
HRT 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
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?
- What if the input doesn't fit in memory?
- What is the worst-case input for your solution?
- How would you parallelize this solution?
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Practice DSA ProblemsSample Answer
Problem Analysis
This problem involves merging three sorted matrices into a single sorted matrix. The underlying pattern here is the merge process from the merge step of the Merge Sort algorithm, which efficie...
Approach
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Initialize Pointers: Start with pointers for each of the three matrices, initialized to the first element of each matrix.
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Compare Elements: In a loop, compare the elements pointed to by...
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