Implement Union Find with O(n) time
Last updated: August 4, 2025
Quick Overview
Implement a Trie data structure that supports get and put operations in O(n) time.
CrowdStrike
August 4, 202537
10
4,042 solved
Implement a Trie data structure that supports get and put operations in O(n) time.
This coding problem is frequently asked during Onsite at CrowdStrike. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. CrowdStrike expects candidates to write production-quality code, not just solve the puzzle.
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
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?
- Can you solve this iteratively instead of recursively (or vice versa)?
- How would you test this solution thoroughly?
- What if the input doesn't fit in memory?
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Practice DSA ProblemsSample Answer
Problem Analysis
To implement a Trie data structure that supports get and put operations in O(n) time, we can recognize that the problem fundamentally involves managing a dynamic set of strings. The Trie, or prefi...
Approach
- Define the TrieNode Class: Each node will contain a dictionary to store children nodes corresponding to characters and a boolean to indicate if it marks the end of a word.
- **Define the Trie...
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