Implement Skip List with streaming input
Last updated: February 24, 2026
Quick Overview
Implement a Skip List data structure that supports efficient insertion, deletion, and search operations with streaming input. The Skip List should allow for dynamic updates as new elements are added, and should maintain a sorted order. Your implementation should handle multiple concurrent insertions and provide a method to retrieve the current state of the list.
Atlassian
February 24, 2026334
5
1,699 solved
Implement a Skip List data structure that supports efficient insertion, deletion, and search operations with streaming input. The Skip List should allow for dynamic updates as new elements are added, and should maintain a sorted order. Your implementation should handle multiple concurrent insertions and provide a method to retrieve the current state of the list.
Atlassian uses this problem in the Onsite 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
- 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
- What is the worst-case input for your solution?
- How would you parallelize this solution?
- Can you solve this iteratively instead of recursively (or vice versa)?
- Can you optimize the space complexity of your solution?
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Practice DSA ProblemsSample Answer
Problem Analysis
A Skip List is a probabilistic data structure that allows for efficient search, insertion, and deletion operations in a sorted sequence of elements. The primary pattern utilized here is the multi-leve...
Approach
- Structure Definition: Define a Node class representing each element in the Skip List, which contains references to multiple forward pointers (one for each level) and a value.
2. **Skip Lis...
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