---
title: "Discussion on \"Prefix Sum -3\" | Hashnode"
description: "Discussion on \"Prefix Sum -3\". Subarray Sum Equals K (Leetcode 560) – From Brute Force to HashMap\nWhen I saw this problem for the first time, honestly my mind just went:“Okay… subarray sum… let’s check all subarrays!” 😅That’s the brute force approach. Later I found the prefix sum..."
url: "https://hashnode.com/posts/prefix-sum-3/68de7fec82bb60c523bea91a"
---

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# [Prefix Sum -3](https://prefix-sum.hashnode.dev/prefix-sum-3?utm_source=hashnode&utm_medium=feed)

Subarray Sum Equals K (Leetcode 560) – From Brute Force to HashMap When I saw this problem for the first time, honestly my mind just went:“Okay… subarray sum… let’s check all subarrays!” 😅That’s the brute force approach. Later I found the prefix sum...

Oct 2, 2025 · 3 min read · prefix-sum.hashnode.dev  
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## Written by

[Sakshi Sharma](https://hashnode.com/@SakshiSharma45)

@SakshiSharma45

  
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Exploring DSA, one problem at a time - learning, coding, and sharing my journey

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