--- title: "Sakshi Sharma (@SakshiSharma45) | Hashnode" description: "Student. Read the latest articles by Sakshi Sharma on Hashnode." url: "https://hashnode.com/@SakshiSharma45" --- @SakshiSharma45 # Sakshi Sharma @SakshiSharma45 · Joined August 2025 Student ### [Prefix Sum - 4](https://prefix-sum.hashnode.dev/prefix-sum-4?utm_source=hashnode&utm_medium=feed) LeetCode 724: Find Pivot Index – A Mathematical Prefix Sum Problem We’ve been solving prefix sum questions, and this one — Find Pivot Index — is actually more about mathematics than coding tricks. The problem says: Find an index where the sum of all... 3 min read · [prefix-sum.hashnode.dev](https://prefix-sum.hashnode.dev/prefix-sum-4?utm_source=hashnode&utm_medium=feed) [Oct 3, 2025](https://hashnode.com/posts/prefix-sum-4/68dfb54c4c6b22043021b649) ### [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... 3 min read · [prefix-sum.hashnode.dev](https://prefix-sum.hashnode.dev/prefix-sum-3?utm_source=hashnode&utm_medium=feed) [Oct 2, 2025](https://hashnode.com/posts/prefix-sum-3/68de7fec82bb60c523bea91a) ### [Prefix Sum -2](https://prefix-sum.hashnode.dev/prefix-sum-2?utm_source=hashnode&utm_medium=feed) LeetCode 724 — Find Pivot Index Author: Sakshi Sharma After learning the basics of prefix sums in the last blog (Running Sum problem), let’s step a little higher. Today’s problem is LeetCode 724: Find Pivot Index. It’s still beginner-friendly, but it... 2 min read · [prefix-sum.hashnode.dev](https://prefix-sum.hashnode.dev/prefix-sum-2?utm_source=hashnode&utm_medium=feed) [Oct 1, 2025](https://hashnode.com/posts/prefix-sum-2/68dd2182424e6c810748b929) ### [Prefix Sum -1](https://prefix-sum.hashnode.dev/prefix-sum-1?utm_source=hashnode&utm_medium=feed) Starting DSA with Prefix Sums — Running Sum of 1D Array (LeetCode 1480) Author: Sakshi Sharma When I began my DSA journey, I wanted a problem that felt like a warm-up jog — simple, useful, and the kind that builds intuition for many harder problems l... 3 min read · [prefix-sum.hashnode.dev](https://prefix-sum.hashnode.dev/prefix-sum-1?utm_source=hashnode&utm_medium=feed) [Oct 1, 2025](https://hashnode.com/posts/prefix-sum-1/68dcfb67bb240c9203048474)