Find All Numbers Disappeared in an Array | C++ | Easy Explained

🔥LeetCode 448 - Find All Numbers Disappeared in an Array | C++ Solution | Easy Explanation In this video, we solve LeetCode 448: Find All Numbers Disappeared in an Array using an efficient O(n) approach in C++. This is a popular array interview question that tests your understanding of indexing, in-place modifications, and optimization techniques. 📌 Problem Statement:- Given an array nums of length n where nums[i] is in the range [1, n], some elements appear twice and others appear once. Find all the numbers in the range [1, n] that do not appear in the array. Example:- Input:- nums = [4,3,2,7,8,2,3,1] Output:- [5,6] 🎯 Topics Covered:- ✔ Arrays ✔ Index Mapping ✔ In-Place Algorithms ✔ LeetCode Interview Questions ✔ C++ Programming ✔ Data Structures and Algorithms 💡 Approach Used:- We use the array itself to mark visited numbers by converting elements at corresponding indices to negative values. After processing the array, the indices that still contain positive values represent the missing numbers. ⏱ Time Complexity:- O(n) 💾 Space Complexity:- O(1) (excluding output array) 📚 This video is perfect for:- • LeetCode beginners • Coding interview preparation • DSA practice • Competitive programming • C++ learners 🔔 Subscribe for more:- ✅ LeetCode Solutions ✅ DSA Tutorials ✅ C++ Programming ✅ Coding Interview Questions ✅ Competitive Programming Problems #leetcode #leetcode448 #findallnumbersdisappearedinanarray #cpp #cplusplus #dsa #arrays #codinginterview #interviewpreparation #algorithms #datastructures #competitiveprogramming #coding #programming #softwareengineer #leetcodeeasy #codingchallenge #problemsolving #tech #developer