LeetCode 268: Missing Number Explained Line by Line | C++

🚀 LeetCode 268: Missing Number Explained Step by Step in C++ | Optimal O(n) Solution In this video, we solve the famous LeetCode 268 — Missing Number problem using the optimal mathematical approach with O(n) time complexity and O(1) extra space. You’ll learn: ✅ How the sum formula works ✅ Why this approach is optimal ✅ Complete line-by-line code explanation ✅ Dry run example ✅ Time and Space Complexity analysis ✅ Interview tips for array problems Problem Statement: Given an array containing n distinct numbers in the range [0, n], return the only number missing from the array. Key Idea: Expected Sum = n × (n + 1) / 2 Missing Number = Expected Sum − Actual Sum Topics Covered: Arrays Math Formula LeetCode 268 C++ STL DSA Interview Preparation Coding Interview Questions #leetcode #missingnumber #leetcode268 #dsa #cplusplus #codinginterview #arrays #algorithms #programming #interviewprep