Merge Two Sorted binary trees
Last updated: October 24, 2025
Quick Overview
Given k sorted graphs, merge them into a single sorted result.
LinkedIn
Coding & Algorithms
Software Engineer
Software Engineer
Technical Screen
Coding & Algorithms
Easy
42
9
3,962 solved
Given k sorted graphs, merge them into a single sorted result.
LinkedIn 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
- 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
Edge cases and input validation
Dynamic programming and memoization
Sorting and searching
Hash maps and frequency counting
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 your solution change if the input was sorted?
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Practice DSA ProblemsSample Answer
Problem Analysis
To solve the problem of merging k sorted binary trees, we can utilize a priority queue (or min-heap) to efficiently extract the smallest elements from the trees as we merge them. This approach is effe...
Approach
- Initialize a priority queue (min-heap) to hold the root nodes of each tree along with their respective tree identifiers.
- Extract the smallest element from the heap (the top element) and ...
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