Validate matrix complete
Last updated: October 1, 2025
Quick Overview
Given a 2D matrix, write a function to determine if all rows and columns of the matrix contain the same set of values, effectively validating that the matrix is complete. The function should return a boolean value: true if the matrix is complete, and false otherwise. The input will be a square matrix of integers, and the output will be a single boolean value.
Splunk
October 1, 2025491
13
2,118 solved
Given a 2D matrix, write a function to determine if all rows and columns of the matrix contain the same set of values, effectively validating that the matrix is complete. The function should return a boolean value: true if the matrix is complete, and false otherwise. The input will be a square matrix of integers, and the output will be a single boolean value.
Coding interviews at Splunk 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
- 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 if the input doesn't fit in memory?
- Can you optimize the space complexity of your 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 2D matrix is complete, we need to ensure that all rows and columns contain the same set of unique values. This suggests a set comparison approach, where we can utilize a single set t...
Approach
- Extract Unique Values from First Row: Create a set from the first row of the matrix to establish the expected unique values. For example, if the first row is
[1, 2, 3], our set will be `{1, 2...
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