Merge Two Sorted linked lists
Last updated: August 7, 2025
Quick Overview
Given three sorted interval lists, merge them into a single sorted result.
Twitter/X
August 7, 2025237
5
3,692 solved
Given three sorted interval lists, merge them into a single sorted result.
This coding problem is frequently asked during Onsite at Twitter/X. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Twitter/X expects candidates to write production-quality code, not just solve the puzzle.
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
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 test this solution thoroughly?
- How would you parallelize this solution?
- What if the input doesn't fit in memory?
- How would your solution change if the input was sorted?
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Brute Force Approach
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