Subarray Sum Equals K Explained 💡 | Brute Force + Optimal Prefix Sum | DSA Telugu Ep.45 скачать в хорошем качестве

Subarray Sum Equals K Explained 💡 | Brute Force + Optimal Prefix Sum | DSA Telugu Ep.45

Welcome to DSA Telugu Series – Episode 45 💻🔥 In this video, we solve the famous interview problem: 👉 Subarray Sum Equals K This is one of the most important Prefix Sum based problems asked in coding interviews. 📘 What You’ll Learn What is Subarray Sum Equals K? Brute Force Approach (0:00 – 4:41) Why Brute Force is inefficient Optimal Prefix Sum + HashMap approach The core trick: currentSum − K logic Step-by-step dry run Time & Space Complexity 💡 Core Idea (Optimal Approach) If current prefix sum is sum We check: 👉 sum − k exists in map? If yes → we found subarray(s) This reduces time complexity from O(n²) to O(n) 🔥 00:00 – Introduction & Problem Statement 01:12 -- Brute Force Approach Explained| 04:41 – Optimal Approach. 🎯 Why This Problem Is Important Subarray Sum Equals K helps you understand: Prefix Sum pattern deeply HashMap usage in DSA Counting subarrays efficiently Interview-level thinking This is a MUST KNOW problem for placements. subarray sum equals k subarray sum equals k leetcode subarray sum equals k explained subarray sum equals k solution subarray sum equals k prefix sum subarray sum equals k optimal approach subarray sum equals k brute force subarray sum equals k hash map subarray sum equals k interview question subarray sum equals k coding problem subarray sum equals k using prefix sum subarray sum equals k using hashmap subarray sum equals k optimal solution subarray sum equals k step by step explanation subarray sum equals k leetcode solution subarray sum equals k time complexity subarray sum equals k brute force vs optimal subarray sum equals k interview preparation how to solve subarray sum equals k subarray sum equals k dsa problem prefix sum subarray sum equals k subarray problems using prefix sum subarray sum equals k coding interview question subarray sum equals k array problem subarray sum equals k explained clearly #dsaintelugu #programmingintelugu #telugucoding #dsa #algorithms #datastructures #java