Detect permutation in matrix
Last updated: August 15, 2025
Quick Overview
Given a matrix of integers, determine if any of its rows or columns contain a permutation of a given target array. The input consists of the matrix and the target array, and the output should be a boolean indicating whether such a permutation exists.
355
3
873 solved
Given a matrix of integers, determine if any of its rows or columns contain a permutation of a given target array. The input consists of the matrix and the target array, and the output should be a boolean indicating whether such a permutation exists.
Coding interviews at LinkedIn 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
- How would you test this solution thoroughly?
- How would you parallelize this solution?
- What is the worst-case input for your solution?
Sharpen Your Skills on Codemia
Practice similar problems with our interactive workspace, get AI feedback, and track your progress.
Practice DSA ProblemsSample Answer
Problem Analysis
To solve the problem of detecting whether any row or column in the matrix contains a permutation of the target array, we can utilize a frequency counting approach. This is effective here because permu...
Approach
- Frequency Count of Target Array: First, create a frequency count (a dictionary) of the elements in the target array. For example, if the target array is [1, 2, 2], the frequency count will be {...
Submit Your Answer
