Missing Number Leetcode Explained | Tekneikos Mastering Arrays

In this video, we tackle the "Missing Number" problem where you are given an array containing n distinct numbers taken from the range [0, n]. The task is to find the missing number in the array. We solve this by calculating the difference between the expected sum and the actual sum of the numbers in the array. Approach: The expected sum of numbers from 0 to n is calculated using the formula: totalSum = n * (n + 1) / 2 We compute the actual sum (expectedSum) by iterating through the array. The missing number is simply: missingNumber = totalSum - expectedSum This approach runs in O(n) time with O(1) space complexity.