Detect palindrome in array
Last updated: September 20, 2025
Quick Overview
Given an array of integers, write a function to detect if any contiguous subarray forms a palindrome. The function should return true if at least one palindromic subarray exists, and false otherwise. Consider both even and odd length palindromes in your solution.
Tesla
September 20, 2025307
15
1,906 solved
Given an array of integers, write a function to detect if any contiguous subarray forms a palindrome. The function should return true if at least one palindromic subarray exists, and false otherwise. Consider both even and odd length palindromes in your solution.
This coding problem is frequently asked during Phone Screen at Tesla. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Tesla expects candidates to write production-quality code, not just solve the puzzle.
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
- What happens if the input contains duplicates?
- How would you test this solution thoroughly?
- What if the input doesn't fit in memory?
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Problem Analysis
To detect palindromic subarrays, we can leverage the two-pointer technique. This approach is suitable here because we need to examine potential palindromic subarrays without unnecessary recomputation....
Approach
- Iterate through each element in the array as a potential center point for odd-length palindromes (e.g., single element center). 2. For each center, expand outward using two pointers to check fo...
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