Find kth largest element in linked list
Last updated: October 8, 2025
Quick Overview
Given a singly linked list and an integer k, write a function to find the kth largest element in the linked list. The function should return the kth largest value, or indicate if k is larger than the number of elements in the list. Your solution should efficiently handle cases with varying list sizes and values.
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October 8, 20259
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3,883 solved
Given a singly linked list and an integer k, write a function to find the kth largest element in the linked list. The function should return the kth largest value, or indicate if k is larger than the number of elements in the list. Your solution should efficiently handle cases with varying list sizes and values.
Snapchat 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
- 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 modify your solution to handle streaming input?
- How would you test this solution thoroughly?
- Can you optimize the space complexity of your solution?
- What if the input doesn't fit in memory?
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Practice DSA ProblemsSample Answer
Problem Analysis
To find the kth largest element in a singly linked list, we can utilize the properties of sorting and selection techniques. The problem necessitates identifying the kth largest value without the need ...
Approach
- Initialization: Create a min-heap to store the k largest elements encountered in the linked list.
- Traversal: Iterate through each node in the linked list:
- If the size of the heap is...
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