Merge Two Sorted binary trees
Last updated: December 24, 2025
Quick Overview
Given two sorted arrays, merge them into a single sorted result.
Zillow
Coding & Algorithms
Software Engineer
Zillow
December 24, 2025Software Engineer
Technical Screen
Coding & Algorithms
Easy
100
13
681 solved
Given two sorted arrays, merge them into a single sorted result.
Coding interviews at Zillow 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
- 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
Data structure selection and trade-offs
Graph algorithms and traversal
Hash maps and frequency counting
Sorting and searching
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?
- How would your solution change if the input was sorted?
- How would you modify your solution to handle streaming input?
Sharpen Your Skills on Codemia
Practice similar problems with our interactive workspace, get AI feedback, and track your progress.
Practice DSA ProblemsSample Answer
Problem Analysis
To merge two sorted binary trees, we can utilize a two-pointer technique similar to merging two sorted arrays. The concept here is that we will traverse both trees simultaneously, comparing the cu...
Approach
- Initialize a new tree: Start with an empty tree that will hold the merged result.
- Use a queue: Employ a queue (or a stack) to help with the level-order traversal of both trees.
- **Iter...
Submit Your Answer
Markdown supported