Merge Two Sorted binary trees
Last updated: November 8, 2025
Quick Overview
Given two sorted matrixs, merge them into a single sorted result.
Cockroach Labs
Coding & Algorithms
Software Engineer
Cockroach Labs
November 8, 2025Software Engineer
Technical Screen
Coding & Algorithms
Hard
227
16
1,388 solved
Given two sorted matrixs, merge them into a single sorted result.
Cockroach Labs uses this problem in the Technical 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
- Quickly identify the optimal approach and its theoretical basis
- Handle complex algorithm design with multiple interacting components
- Write concise, elegant code under time pressure
- Prove correctness of your approach and discuss alternative solutions
- Optimize beyond the obvious: discuss constant factor improvements
- Address follow-up variations and explain how the solution generalizes
Key Topics to Cover
Binary search and divide and conquer
Tree structures and recursion
Dynamic programming and memoization
Common algorithm patterns (sliding window, two pointers, BFS/DFS)
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 solve this in a single pass?
- What is the worst-case input for your solution?
- How would your solution change if the input was sorted?
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Practice DSA ProblemsSample Answer
Problem Analysis
The problem requires merging two sorted matrices into a single sorted result. This can be approached using the two pointers technique because both matrices are sorted. The main advantage of using ...
Approach
- Initialization: Start by initializing two pointers, one for each matrix (
i = 0for the first matrix,j = 0for the second matrix). Also, create an empty list to store the merged result.
2....
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