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Problem: First Missing Positive

Explore how to identify the first missing positive integer in an unsorted array using C#. Understand the cyclic sort technique that rearranges elements in place to achieve optimal time and space complexity. This lesson guides you through implementing a solution with O(n) time and O(1) space complexity, reinforcing concepts in array manipulation and algorithm efficiency.

Statement

Given an unsorted integer array nums, find and return the smallest positive integer that is not present in nums.

Your solution must run in O(n)O(n) time and use O(1)O(1) auxiliary space.

Constraints:

  • 11 \leq ...