Detect permutation in array
Last updated: December 10, 2025
Quick Overview
Given array, detect all occurrences of the anagram pattern.
Confluent
December 10, 202563
14
441 solved
Given array, detect all occurrences of the anagram pattern.
This coding problem is frequently asked during Phone Screen at Confluent. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Confluent expects candidates to write production-quality code, not just solve the puzzle.
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
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 test this solution thoroughly?
- Can you solve this iteratively instead of recursively (or vice versa)?
- What happens if the input contains duplicates?
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Problem Analysis
To detect all occurrences of an anagram pattern in an array, we can utilize the sliding window technique combined with frequency counting using a hash map. The reason this approach applies here is tha...
Approach
- Define the Inputs: We have a main array
arrand a pattern arraypattern. - Frequency Count: Create a frequency map for the
patternto count occurrences of each character. - **Sl...
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