LeetCode 215: Kth Largest Element in an Array | C# Solution | QuickSelect Algorithm

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📝 In this video, I solve the #leetcode #kthlargest problem where we need to find the kth largest element in an unsorted array using the optimized #quickselect algorithm in #csharp. The optimal solution achieves O(n) average time complexity and O(1) space complexity.

## ⏱️ TIMESTAMPS
00:00 - Understanding the problem statement
00:57 - Naive approach - sorting
01:23 - Understanding Quick Sort Algorithm
05:31 - Quick Sort - Big O Notation explained
06:29 - Quick Select algorithm
07:52 - C# solution walk-through
09:11 - Solution analysis - runtime + memory

## 🔍 KEY CONCEPTS
- QuickSelect Algorithm
- Partitioning techniques
- Average vs worst-case time complexity
- In-place selection algorithms
- Priority Queues alternative approach

## 💡 LEARNING POINTS
- Implementing the QuickSelect algorithm in C#
- Understanding partition-based selection algorithms
- Optimizing selection problems without full sorting
- Handling edge cases for array selection problems

## 🔗 RELATED LEETCODE PROBLEMS
- LeetCode 347: Top K Frequent Elements
- LeetCode 973: K Closest Points to Origin
- LeetCode 703: Kth Largest Element in a Stream
- LeetCode 414: Third Maximum Number

## 👥 TARGET AUDIENCE
This video is ideal for software engineers preparing for coding interviews, C# developers wanting to improve their algorithm skills, and computer science students learning selection algorithms.

## 📚 PREREQUISITES
- Basic understanding of arrays in C#
- Familiarity with sorting algorithms
- Basic knowledge of time and space complexity

## 🔗 USEFUL LINKS

## 💎 ADDITIONAL TIPS
- Focus on the average-case O(n) time complexity of QuickSelect vs the O(n log n) of sorting approaches
- Discuss why the QuickSelect algorithm is more efficient than using a heap for this specific problem
- Explain the randomized pivot selection to avoid worst-case scenarios

## 🔔 SUBSCRIBE!
If you found this video helpful, please hit the like button and subscribe for more coding interview preparation content! Share your questions or alternative approaches in the comments below.

#leetcode215 #quickselect #csharptutorial #codinginterview #algorithmsanddata #kthlargestelement #interviewprep #datastructures #selectionalgoritm #arrayproblems

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💻 Full Solution Code Available!
You can find the complete C# implementation for this problem on GitHub:

🔍 Got Questions?
If any part of the solution needs clarification or if you have alternative approaches, drop a comment below! I’ll be happy to discuss.

📢 Request Alert!
Want me to cover a specific LeetCode problem next? Let me know which one in the comments!
P.S. Don’t forget to check the video description for additional resources and related problems!
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