LeetCode 209: Minimum Size Subarray Sum | Java Solution | Sliding Window

📝 In this tutorial, I solve the #leetcode minimum size subarray sum problem using the #slidingwindow technique. Given an array of positive integers and a target sum, find the minimum length subarray that sums to at least the target.

⏱️ **Time Complexity**: O(n) - single pass through the array
🧮 **Space Complexity**: O(1) - constant extra space

## ⏰ Timestamps
00:00 - Understanding problem statement
00:53 - Brute Force Approach
02:45 - Brute Force - Big O Notation
03:46 - Optimized solution - Sliding Window
04:23 - Simulating sliding window
07:23 - Sliding Window - Big O Notation
08:00 - Java solution walk-through
09:14 - Solution analysis - runtime + memory

## 🔑 Key Concepts
- Sliding Window Technique
- Two-pointer approach
- Subarray manipulation
- Variable size window

## 💡 Learning Points
- How to efficiently find a minimum size subarray with a constraint
- When and how to shrink a sliding window
- Optimizing from O(n²) brute force to O(n) sliding window
- Handling edge cases like empty arrays or impossible targets

## 🔄 Related Problems
- LeetCode 3: Longest Substring Without Repeating Characters
- LeetCode 76: Minimum Window Substring
- LeetCode 713: Subarray Product Less Than K
- LeetCode 1004: Max Consecutive Ones III

## 👥 Target Audience
This video is for software engineers preparing for coding interviews and those wanting to master the sliding window technique in Java.

## 📚 Prerequisites
- Basic Java knowledge
- Understanding of arrays and loops
- Familiarity with time and space complexity concepts

## 🔗 Links
- Problem: https://leetcode.com/problems/minimum-size-subarray-sum/
- Solution Code: https://leetcode.com/problems/minimum-size-subarray-sum/solutions/6814708/sliding-window-solution-in-java-with-vid-1pqs

## 💭 Additional Tips
- Pay special attention to how we adjust the window size dynamically
- Remember to check if a solution is possible at all
- Notice how we track the minimum length while expanding and contracting the window

## 🙏 Call to Action
If you found this solution helpful, please subscribe to get more #codinginterview preparation content! Leave your questions or alternative approaches in the comments below. Let me know what #leetcode problems you'd like me to cover next! #java #algorithms #slidingwindow #subarray

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