Validate array symmetric
Last updated: January 27, 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.
Bloomberg
January 27, 2026421
9
2,989 solved
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.
Bloomberg uses this problem in the Phone Screen 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?
- What is the worst-case input for your solution?
- Can you solve this iteratively instead of recursively (or vice versa)?
- Can you solve this in a single pass?
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Practice DSA ProblemsSample Answer
Problem Analysis
To determine if an array is symmetric, we need to check if the array reads the same forwards and backwards. This is a classic problem that can be efficiently solved using the two pointers techniqu...
Approach
- Initialize two pointers: one at the start (
left) of the array (index 0) and one at the end (right) of the array (indexlen(array) - 1). - While
leftis less thanright, compare the ele...
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