Detect anagram in array
Last updated: December 23, 2025
Quick Overview
Given array, detect all occurrences of the anagram pattern.
Dropbox
December 23, 20251
14
231 solved
Given array, detect all occurrences of the anagram pattern.
Coding interviews at Dropbox 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 modify your solution to handle streaming input?
- What happens if the input contains duplicates?
- What is the worst-case input for your solution?
- What if the input doesn't fit in memory?
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Problem Analysis
The problem requires us to detect all occurrences of an anagram pattern within a given array. An anagram is a rearrangement of letters in a word or phrase, meaning we will need to check sets of charac...
Approach
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Character Frequency Calculation: First, we need to create a frequency count (dictionary) of the characters in the anagram pattern.
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Sliding Window Initialization: Next, we slide over th...
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