Validate matrix sorted
Last updated: October 12, 2025
Quick Overview
Determine if a given matrix satisfies the balanced property.
Salesforce
Coding & Algorithms
Machine Learning Engineer
Salesforce
October 12, 2025Machine Learning Engineer
Phone Screen
Coding & Algorithms
Hard
19
11
3,071 solved
Determine if a given matrix satisfies the balanced property.
Salesforce 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
- 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
Tree structures and recursion
Edge cases and input validation
Common algorithm patterns (sliding window, two pointers, BFS/DFS)
Dynamic programming and memoization
Time and space complexity analysis
Sorting and searching
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 parallelize this solution?
- What if the input doesn't fit in memory?
- Can you optimize the space complexity of your solution?
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Practice DSA ProblemsSample Answer
Problem Analysis
To determine if a given matrix satisfies the balanced property, we need to check if every row is sorted in non-decreasing order and if the first element of each subsequent row is greater than or equal...
Approach
- Initialize a variable
prev_lastto keep track of the last element of the previous row. - Iterate through each row of the matrix:
- For each row, check if it is sorted in non-decreasing order ...
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