Implement LRU Cache with without recursion
Last updated: April 23, 2026
Quick Overview
Implement a Skip List data structure that supports push, pop, and peek operations in O(n) time.
Airbnb
April 23, 202612
10
1,861 solved
Implement a Skip List data structure that supports push, pop, and peek operations in O(n) time.
Airbnb uses this problem in the Technical 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
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 modify your solution to handle streaming input?
- What happens if the input contains duplicates?
- Can you solve this in a single pass?
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Practice DSA ProblemsSample Answer
Problem Analysis
The problem requires us to implement a Skip List data structure that supports push, pop, and peek operations in O(n) time. A Skip List is an efficient probabilistic alternative to balanced trees...
Approach
- Data Structure Design: We will use a class
Nodeto represent each element in the Skip List, which will contain pointers to nodes on different levels. TheSkipListclass will maintain a head...
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