1539. Kth Missing Positive Number | Optimal Approach #leetcode

1539. Kth Missing Positive Number https://leetcode.com/problems/kth-missing-positive-number Video Chapters: 00:00: Video Content Intro 0:14: Question go through 0:48: Solution think through 3:05: Solution Visualiztion 4:18: Return statement "k + right + 1" Explained 5:57: Solution code Algorithm Steps: 1. Initialize two pointers: - left at the start of the array (index 0) - right at the end of the array (index len(arr) - 1) 2. Enter a binary search loop: a. Calculate the middle index pivot = (left + right) // 2 b. Compute the number of missing integers before the pivot element: - arr[pivot] - pivot - 1 c. Compare this number with k: - If it's greater than or equal to k, move right to pivot - 1 - Otherwise, move left to pivot + 1 3. After the loop ends, return k + right + 1 as the kth missing positive integer. Complexity Analysis: Time: O(N) Space: O(N) Link to the code: https://github.com/codewonkamentor/LeetCodeChannel/blob/main/1539.%20Kth%20Missing%20Positive%20Number%20%5BEasy%5D/kth_missing_number.py #leetcode #leetcodecoding #leetcodesolution #optimalsolution #education #codinglife #faang #interview #interviewquestions #coding #programming #codinginterview