Subarray Sum Equals K in O(n) 🔥 | HashMap Trick

Struggling with DSA problems? 🤯

In this short, I explain the famous Subarray Sum Equals K problem using Prefix Sum + HashMap in the easiest way possible!

✅ Understand logic step by step
✅ Why we use map.put(0,1)
✅ How to solve in O(n) time
✅ Works even with negative numbers

This is one of the most asked interview questions for companies like Google, Amazon, and Microsoft.

💻 Perfect for beginners learning Data Structures & Algorithms (DSA)

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