Merge K Sorted graphs
Last updated: April 10, 2026
Quick Overview
Given three sorted arrays, merge them into a single sorted result.
Twitter/X
Coding & Algorithms
Software Engineer
Twitter/X
April 10, 2026Software Engineer
Technical Screen
Coding & Algorithms
Medium
105
8
1,842 solved
Given three sorted arrays, merge them into a single sorted result.
Coding interviews at Twitter/X 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
Binary search and divide and conquer
Tree structures and recursion
Hash maps and frequency counting
Time and space complexity analysis
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?
- How would you test this solution thoroughly?
- Can you optimize the space complexity of your solution?
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Practice DSA ProblemsSample Answer
Problem Analysis
To merge three sorted arrays into a single sorted array, we can identify the two-pointer technique as a suitable pattern. This technique allows us to traverse multiple sorted lists concurrently, effic...
Approach
- Initialize three pointers (i, j, k) to 0, which will keep track of the current index for each of the three arrays.
- Create an empty list to store the merged result.
- Use a while loop to run...
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