Validate grid balanced
Last updated: October 3, 2025
Quick Overview
Given a 2D grid of integers, write a function to determine if the grid is balanced. A grid is considered balanced if the sum of the elements in each row is equal to the sum of the elements in each column. The function should return a boolean value indicating whether the grid is balanced or not.
Supabase
October 3, 20251
4
361 solved
Given a 2D grid of integers, write a function to determine if the grid is balanced. A grid is considered balanced if the sum of the elements in each row is equal to the sum of the elements in each column. The function should return a boolean value indicating whether the grid is balanced or not.
Coding interviews at Supabase focus on problem-solving approach as much as the final solution. The interviewer wants to see you break down the problem, consider edge cases, and optimize iteratively. Communication throughout the process is key.
What the Interviewer Expects
- Identify the correct data structure and algorithm for the problem
- Write clean, bug-free code with proper variable naming
- Analyze time and space complexity correctly
- Handle basic edge cases (empty input, single element)
- Communicate your thought process while coding
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?
- How would you parallelize this solution?
- How would your solution change if the input was sorted?
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Practice DSA ProblemsSample Answer
Problem Analysis
To determine if a grid is balanced, we need to check if the sum of each row equals the sum of each column. This problem can be approached using a straightforward method where we calculate two separate...
Approach
- Initialize Sums: Create two lists,
row_sumsandcol_sums, initialized to zero. These will hold the sums of each row and each column, respectively. - Iterate Through Grid: Use a nested ...
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