Detect anagram in string
Last updated: November 4, 2025
Quick Overview
Given string, detect all occurrences of the anagram pattern.
Citadel
November 4, 202549
10
3,798 solved
Given string, detect all occurrences of the anagram pattern.
Coding interviews at Citadel 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
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 in a single pass?
- How would you parallelize this solution?
- What happens if the input contains duplicates?
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Problem Analysis
To detect all occurrences of an anagram pattern within a given string, we can utilize the sliding window technique. This approach is apt because we need to continuously check for substrings of a c...
Approach
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Frequency Count: First, we will build a frequency count of characters in the anagram pattern. For example, if our pattern is 'abc', the frequency count would be {'a': 1, 'b': 1, 'c': 1}.
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