Merge K Sorted strings
Last updated: October 4, 2025
Quick Overview
Given three sorted binary trees, merge them into a single sorted result.
Capital One
October 4, 20257
8
1,835 solved
Given three sorted binary trees, merge them into a single sorted result.
This coding problem is frequently asked during Take-home Project at Capital One. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Capital One 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 modify your solution to handle streaming input?
- Can you solve this iteratively instead of recursively (or vice versa)?
- How would you parallelize this solution?
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Practice DSA ProblemsSample Answer
Problem Analysis
In this problem, we are tasked with merging three sorted binary trees into a single sorted result. The problem can be approached using a merge technique commonly used in merging multiple sorted li...
Approach
To merge the three sorted binary trees, we can follow these steps:
- Initialize a min-heap to store the root nodes of the three trees.
- Insert the root nodes of each tree into the min-heap (if they...
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