Detect anagram in string
Last updated: July 27, 2025
Quick Overview
Given string, detect all occurrences of the anagram pattern.
DoorDash
Coding & Algorithms
Software Engineer
DoorDash
July 27, 2025Software Engineer
Technical Screen
Coding & Algorithms
Hard
42
11
2,162 solved
Given string, detect all occurrences of the anagram pattern.
Coding interviews at DoorDash 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
- Quickly identify the optimal approach and its theoretical basis
- Handle complex algorithm design with multiple interacting components
- Write concise, elegant code under time pressure
- Prove correctness of your approach and discuss alternative solutions
- Optimize beyond the obvious: discuss constant factor improvements
- Address follow-up variations and explain how the solution generalizes
Key Topics to Cover
Graph algorithms and traversal
Data structure selection and trade-offs
Dynamic programming and memoization
Hash maps and frequency counting
Tree structures and recursion
Edge cases and input validation
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
- What happens if the input contains duplicates?
- What is the worst-case input for your solution?
- How would your solution change if the input was sorted?
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Problem Analysis
To detect all occurrences of an anagram pattern in a given string, we can utilize the Sliding Window technique combined with Frequency Counting. The reason this approach is suitable is that an...
Approach
- Initialize Frequency Counters: Create a frequency counter for the characters in the anagram pattern and another for the first window of characters in the input string of the same length as the ...
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