Leetcode #1539 (C Code): Find kth missing position


I've following problem statement at hand, I came across an interesting 2 liner, C solution for it under leedcode discussion section. I tried to decompose it to understand what it means, and except one small line, I understood the rest. My question is at the end.

Leetcode Problem Statement:

Given an array arr of positive integers sorted in a strictly increasing order, and an integer k. Find the kth positive integer that is missing from this array.

Read more here: https://stackoverflow.com/questions/64900655/leetcode-1539-c-code-find-kth-missing-position

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