Merge Two Sorted matrixs
Last updated: January 11, 2026
Quick Overview
Given k sorted grids, merge them into a single sorted result.
Netflix
Coding & Algorithms
Machine Learning Engineer
Netflix
January 11, 2026Machine Learning Engineer
Phone Screen
Coding & Algorithms
Easy
274
10
3,711 solved
Given k sorted grids, merge them into a single sorted result.
Netflix uses this problem in the Phone Screen 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
- 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
Sorting and searching
Dynamic programming and memoization
Hash maps and frequency counting
Common algorithm patterns (sliding window, two pointers, BFS/DFS)
Graph algorithms and traversal
Tree structures and recursion
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 you test this solution thoroughly?
- What if the input doesn't fit in memory?
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Practice DSA ProblemsSample Answer
Problem Analysis
To merge k sorted grids, we can utilize a min-heap (or priority queue) which is a suitable data structure for this problem. The reason for choosing a min-heap is that it allows us to efficiently e...
Approach
- Initialize a min-heap. We will use this to keep track of the smallest elements from each of the k grids.
- Insert the first element of each grid into the min-heap. This gives us the initia...
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