Transform linked list to tree
Last updated: September 3, 2025
Quick Overview
Convert the given array to tree structure following the specified rules.
Zillow
Coding & Algorithms
Software Engineer
Zillow
September 3, 2025Software Engineer
Onsite
Coding & Algorithms
Medium
6
12
4,031 solved
Convert the given array to tree structure following the specified rules.
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
- Recognize the underlying problem pattern (sliding window, two pointers, BFS/DFS, etc.)
- Discuss multiple approaches and trade-offs before coding
- Implement an optimal solution with clean, production-quality code
- Handle all edge cases including boundary conditions and invalid input
- Optimize both time and space complexity with clear justification
- Test your solution systematically with well-chosen examples
Key Topics to Cover
Data structure selection and trade-offs
Common algorithm patterns (sliding window, two pointers, BFS/DFS)
Sorting and searching
Time and space complexity analysis
Binary search and divide and conquer
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
- Can you optimize the space complexity of your solution?
- How would you test this solution thoroughly?
- What is the worst-case input for your solution?
- Can you solve this in a single pass?
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Practice DSA ProblemsSample Answer
Problem Analysis
To solve the problem of converting an array into a tree structure, we need to recognize that this is a recursive problem that can be efficiently approached using a divide and conquer strategy. The...
Approach
- Identify the Base Case: If the array is empty, return
Nonebecause there are no nodes to create. - Find the Middle Element: Compute the middle index of the array using `(start + end) // ...
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