Detect anagram in linked list
Last updated: July 2, 2025
Quick Overview
Given a linked list of characters, determine if any contiguous subsequence of the list forms an anagram of a given target string. The function should return true if such an anagram exists within the linked list, and false otherwise. The solution should efficiently traverse the linked list while maintaining a count of character frequencies.
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Given a linked list of characters, determine if any contiguous subsequence of the list forms an anagram of a given target string. The function should return true if such an anagram exists within the linked list, and false otherwise. The solution should efficiently traverse the linked list while maintaining a count of character frequencies.
Coding interviews at Pinterest 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
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
- Can you solve this iteratively instead of recursively (or vice versa)?
- What if the input doesn't fit in memory?
- How would your solution change if the input was sorted?
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Problem Analysis
To determine if any contiguous subsequence of a linked list of characters forms an anagram of a target string, we can utilize a sliding window technique combined with a **character frequency count...
Approach
- Initialize Frequencies: Count the frequency of characters in the target string using a dictionary (or array if the character set is small). For example, for target
"abc", the frequency will b...
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