Optimize inversion for streaming input
Last updated: April 20, 2026
Quick Overview
Find an efficient solution for inversion given the O(1) space constraint.
Mastercard
Coding & Algorithms
Software Engineer
Mastercard
April 20, 2026Software Engineer
Technical Screen
Coding & Algorithms
Medium
4
3
1,095 solved
Find an efficient solution for inversion given the O(1) space constraint.
Coding interviews at Mastercard 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
- 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
Sorting and searching
Dynamic programming and memoization
Graph algorithms and traversal
Binary search and divide and conquer
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
- Can you solve this iteratively instead of recursively (or vice versa)?
- How would you modify your solution to handle streaming input?
- Can you solve this in a single pass?
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Practice DSA ProblemsSample Answer
Problem Analysis
The task is to find inversions in a stream of integers while adhering to an O(1) space constraint. An inversion in an array is defined as a pair of indices (i, j) such that i < j and arr[i] > arr[j]. ...
Approach
- Initialization: Start with a count of inversions set to zero and a structure to keep track of the current maximum value seen.
- Streaming Input: For each incoming number, compare it with...
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