Detect permutation in linked list
Last updated: July 26, 2025
Quick Overview
Given string, detect all occurrences of the anagram pattern.
Grafana Labs
July 26, 2025160
12
2,531 solved
Given string, detect all occurrences of the anagram pattern.
This coding problem is frequently asked during Phone Screen at Grafana Labs. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Grafana Labs 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
- How would your solution change if the input was sorted?
- Can you solve this iteratively instead of recursively (or vice versa)?
- What happens if the input contains duplicates?
- What is the worst-case input for your solution?
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