Validate array symmetric
Last updated: June 9, 2026
Quick Overview
Given an array, write a function to determine if it is symmetric, meaning it reads the same forwards and backwards. The function should take an array of integers as input and return a boolean value: true if the array is symmetric and false otherwise.
ServiceNow
June 9, 20267
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Given an array, write a function to determine if it is symmetric, meaning it reads the same forwards and backwards. The function should take an array of integers as input and return a boolean value: true if the array is symmetric and false otherwise.
ServiceNow 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
- Can you solve this in a single pass?
- How would you test this solution thoroughly?
- What is the worst-case input for your solution?
- How would you parallelize this solution?
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Practice DSA ProblemsSample Answer
Problem Analysis
To determine if an array is symmetric, we need to check if the elements read the same forwards and backwards. The pattern that applies here is the two pointers technique. With this approach, we ca...
Approach
- Initialize two pointers: One pointer
leftat the start of the array (index 0) and another pointerrightat the end of the array (indexlen(array) - 1). - **Iterate while
leftis less...
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