Leetcode Problem 1539. Kth Missing Positive Number

1539. Kth Missing Positive Number

Leetcode Solutions

Approach: Binary Search

  1. Initialize left and right pointers to the start and end of the array respectively.
  2. Perform binary search: a. Calculate the middle index as pivot. b. Check the number of missing integers before arr[pivot]. c. If the number of missing integers is less than k, move the left pointer to pivot + 1. d. Otherwise, move the right pointer to pivot - 1.
  3. After the binary search ends, the left pointer will be at the smallest index such that the number of missing integers is at least k. The kth missing number will be k + left.
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Approach: Brute Force

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