Detect palindrome in array
Last updated: September 29, 2025
Quick Overview
Given an array of integers, write a function to detect all occurrences of palindromic subarrays. The function should return a list of all unique palindromic subarrays found within the input array. Each subarray should be represented as an array of integers, and the output should maintain the order of their first occurrence.
Morgan Stanley
September 29, 202510
5
819 solved
Given an array of integers, write a function to detect all occurrences of palindromic subarrays. The function should return a list of all unique palindromic subarrays found within the input array. Each subarray should be represented as an array of integers, and the output should maintain the order of their first occurrence.
Morgan Stanley 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
- How would you modify your solution to handle streaming input?
- What if the input doesn't fit in memory?
- Can you optimize the space complexity of your solution?
Sharpen Your Skills on Codemia
Practice similar problems with our interactive workspace, get AI feedback, and track your progress.
Practice DSA ProblemsSample Answer
Problem Analysis
To detect palindromic subarrays within an array of integers, we can use the expand around center technique. This approach is particularly efficient for identifying palindromic structures because a...
Approach
- Iterate through each index of the array to consider it as a potential center of a palindrome.
- For each index, expand around the center for both odd and even length palindromes:
- ...
Submit Your Answer
