Subarray Sum Equals K – Optimal O(n) Solution | LeetCode 560
Автор: Vandana Codes
Загружено: 2026-02-14
Просмотров: 75
Описание:
Subarray Sum Equals K – Optimal O(n) Solution | LeetCode 560
In this video, we solve LeetCode 560 – Subarray Sum Equals K step by step using the powerful Prefix Sum + HashMap technique.
This problem is frequently asked in product-based companies like Amazon, Google, and Microsoft, and it’s a must-know pattern for mastering subarray problems.
🚀 What You’ll Learn:
Why the brute force solution is O(n²)
How Prefix Sum works
How HashMap helps reduce time complexity to O(n)
Intuition behind the optimal approach
Dry run with example
JavaScript implementation
Time & Space Complexity analysis
If you’re preparing for coding interviews, this is an essential pattern to master!
🧠 Pattern Covered:
Prefix Sum + HashMap
(Important for subarray & cumulative sum problems)
📌 Don’t forget to like, share, and subscribe for more DSA & JavaScript interview content.
#leetcode #dsa #codinginterview #prefixsum #hashmap #faang #faanginterviewprep
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