LeetCode Problem #1: Two Sum | Complete Solution Explanation | Coding Challenge Day 1/40

Welcome to Day 1 of my 40-day coding challenge! 🚀 In this video, I solve LeetCode Problem #1: Two Sum – one of the most famous coding interview questions. I explain the problem statement, walk through the logic, and provide a complete solution. 🔗 Problem Link: https://leetcode.com/problems/two-sum/ 📝 Problem Statement: Given an array of integers nums and an integer target, return the indices of the two numbers that add up to the target. 🧠 What You'll Learn: ✅ Understanding the Two Sum problem ✅ Brute force approach (O(n²)) ✅ Optimized solution using Hash Map (O(n)) ✅ Step-by-step code explanation ✅ Time & Space complexity analysis 💻 Solution Approaches Covered: Approach Time Complexity Space Complexity Brute Force O(n²) O(1) Hash Map (Optimal) O(n) O(n) 🎯 Example: text Input: nums = [2,7,11,15], target = 9 Output: [0,1] Explanation: nums[0] + nums[1] = 2 + 7 = 9 📚 This is Part of My 40-Day Coding Challenge: Day 1: Two Sum ✅ Day 2: Coming soon... Day 3: Coming soon... 📫 Connect with Me: LinkedIn: https://www.linkedin.com/in/raunak-shahu-9308a83a1/ X (Twitter): https://x.com/RaunakS68078 GitHub: https://github.com/raunak2015 🔔 Subscribe for More: If you found this helpful, please Like 👍, Share 🔄, and Subscribe 🔔 to follow along with my 40-day coding challenge! 💬 Questions? Drop a comment below – I'll reply to everyone! #LeetCode #TwoSum #CodingInterview #DataStructures #Algorithms #Python #CodingChallenge #LeetCodeSolution #InterviewPreparation #CodeWithRaunak