Detect palindrome in array
Last updated: October 22, 2025
Quick Overview
Given array, detect all occurrences of the anagram pattern.
Plaid
October 22, 202547
12
2,189 solved
Given array, detect all occurrences of the anagram pattern.
Plaid uses this problem in the Onsite to evaluate your algorithmic thinking. They expect you to discuss multiple approaches, analyze trade-offs between them, and implement the optimal solution with clean, readable code.
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
- What happens if the input contains duplicates?
- Can you solve this in a single pass?
- What is the worst-case input for your solution?
- Can you optimize the space complexity of your solution?
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Practice DSA ProblemsSample Answer
Problem Analysis
To detect all occurrences of an anagram pattern in an array, we can utilize the sliding window technique combined with frequency counting. The anagram relationship means that two strings or se...
Approach
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Frequency Count of the Pattern: We will create a frequency dictionary for the given anagram pattern.
For example, if the pattern is
"abc", our frequency dictionary will be:
...
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