Count median in interval list
Last updated: November 6, 2025
Quick Overview
Count the number of maximum path in the given linked list.
Shopify
Coding & Algorithms
Software Engineer
Shopify
November 6, 2025Software Engineer
Phone Screen
Coding & Algorithms
Medium
10
10
3,164 solved
Count the number of maximum path in the given linked list.
Shopify 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
- 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
Data structure selection and trade-offs
Edge cases and input validation
Time and space complexity analysis
Hash maps and frequency counting
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 test this solution thoroughly?
- Can you optimize the space complexity of your solution?
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Practice DSA ProblemsSample Answer
Problem Analysis
The problem requires us to count the number of maximum paths in a linked list. This suggests that we need to traverse the list while keeping track of certain properties of the nodes. The two-pointer t...
Approach
- Initialize a hashmap to store the count of paths leading to each node in the linked list.
- Traverse the linked list, and for each node:
- If the current node has been visited (exists in the ha...
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