Merge Three Sorted arrays
Last updated: September 12, 2025
Quick Overview
Given two sorted interval lists, merge them into a single sorted result.
Uber
September 12, 202540
7
4,058 solved
Given two sorted interval lists, merge them into a single sorted result.
This coding problem is frequently asked during Technical Screen at Uber. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Uber 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
- Can you optimize the space complexity of your solution?
- Can you solve this iteratively instead of recursively (or vice versa)?
- How would your solution change if the input was sorted?
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Problem Analysis
To merge three sorted arrays, a two-pointer technique is appropriate. The reason for using two pointers is that each array is sorted, allowing us to efficiently traverse through them while maintaining...
Approach
- Initialize three pointers, one for each array, all starting at index 0.
- Create an empty result list to store the merged output.
- Compare the current elements of the three arrays using the po...
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