Two Sum LeetCode Easy Optimal On Solution using Hash Map

🔹 Problem: Two Sum (LeetCode) In this video, we solve the classic Two Sum problem using an optimized approach. This is one of the most frequently asked coding interview questions and is essential for beginners in Data Structures and Algorithms (DSA). The goal is to find two indices in an array such that their values add up to a given target. --- 🔹 Approach: Instead of using a brute-force approach (O(n^2)), we optimize the solution using a hash map (unordered_map in C++). Steps: 1. Traverse the array 2. For each element, calculate: complement = target - nums[i] 3. Check if complement exists in the hash map 4. If it exists - return indices 5. Otherwise - store current value with index This reduces the time complexity to O(n), making the solution efficient. --- 🔹 Time Complexity: O(n) 🔹 Space Complexity: O(n) --- 🔗 GitHub: https://github.com/DhruvOzha85 🔗 LeetCode Profile: https://leetcode.com/u/DhruvOzha/ 🔗 LinkedIn: https://www.linkedin.com/in/dhruv-ozha-bb378639b --- 📌 Notes: - One of the most asked interview problems - Introduces hash maps (important DSA concept) - Helps in understanding optimization techniques --- 🔥 Follow for more daily DSA problem solutions! #leetcode #twosum #dsa #codinginterview #cplusplus #programming #datastructures #algorithms #hashmap #coding #leetcodeeasy #tech #softwareengineer #placements #codingpractices two sum, leetcode two sum, two sum solution, dsa problems, coding interview questions, c++ dsa, hashmap solution, leetcode easy, algorithms, data structures, coding practice, interview prep, software engineer, programming, leetcode solutions, beginner dsa, two sum c++, optimal solution two sum