Validate array balanced
Last updated: May 23, 2026
Quick Overview
Given an array of integers, determine if the array is balanced. An array is considered balanced if the sum of the elements in the left half is equal to the sum of the elements in the right half. Return true if the array is balanced and false otherwise.
HRT
May 23, 2026297
14
3,715 solved
Given an array of integers, determine if the array is balanced. An array is considered balanced if the sum of the elements in the left half is equal to the sum of the elements in the right half. Return true if the array is balanced and false otherwise.
HRT uses this problem in the Take-home Project 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 if the input doesn't fit in memory?
- Can you solve this in a single pass?
- How would you modify your solution to handle streaming input?
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Problem Analysis
To determine if an array is balanced, we need to compare the sum of the elements in the left half to the sum of the elements in the right half. This leads us to recognize that the problem has a straig...
Approach
- First, calculate the midpoint of the array. If the array has an odd number of elements, the middle element belongs to neither half.
- Split the array into two halves: the left half consists of ele...
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