LeetCode 1: Two Sum | C++ Solution + Step-by-Step Explanation (Beats 100%)

LeetCode 1: Two Sum | C++ Solution + Step-by-Step Explanation (Beats 100%) Welcome to *CodeWithBK* ! In this video, we solve *LeetCode Problem 1: Two Sum* using *C++*, with a clear step-by-step explanation and an optimised solution that beats 100% in runtime. - Understand the *Two Sum* problem - Step-by-step logic building in C++ - Beginner-friendly and interview-oriented explanation - Covers edge cases and optimisations - Efficient solution walkthrough with hashmap approach 🧠 Problem Summary: Given an array of integers `nums` and an integer `target`, return indices of the two numbers such that they add up to `target`. You may assume that each input would have exactly one solution, and you may not use the same element twice. You can return the answer in any order. 📌 Prerequisites: - Basic understanding of C++ syntax - Familiarity with arrays and indexing - Knowledge of hashmaps (unordered_map in C++) 🎯 Who is this video good for: - Students preparing for coding interviews - Beginners learning DSA in C++ - Programmers improving problem-solving skills - LeetCode enthusiasts looking for optimised C++ solutions 📌 Topics Covered: - C++ solution for Two Sum - How to find the optimised approach - Using hashmap (unordered_map) in C++ - Handling edge cases and efficiency analysis 📁 Code & Resources: Timestamps: 00:00 Introduction 00:21 Problem explanation 00:45 solution 08:20 C++ code 11:07 optimisations 14:17 dry run for edge cases 🧑‍💻 Want more LeetCode problems solved in C++? Check out the full LeetCode C++ Playlist on CodeWithBK! : https://www.youtube.com/playlist?list=PL8Qg089TZ04bRmVvaP1PFkTtV2qg8NgrV 👍 Don't forget to like, comment, and subscribe for more tutorials on C++ LeetCode solutions and other coding topics! 💬 Got questions? Drop them in the comments—we love helping out! Stay connected: Subscribe: https://www.youtube.com/@CodeWithBK Email: [email protected] Discord: https://discord.gg/3d2U25Zs Instagram ▶️ https://www.instagram.com/balkrishna_srivastava Coding mentor profile: https://www.codementor.io/@balkrishnasrivastava12 For 1:1 sessions, reach out to me here : https://www.codementor.io/@balkrishnasrivastava12 My YouTube channel where I teach in Hindi : https://www.youtube.com/@CodeWithBKHindi #LeetCode #CodeWithBK #CppProgramming #CPPTutorial #DSA #LeetCodeSolution #DSAInCPP #InterviewQuestions #StringProblems #CPPProgramming