Solution: First Missing Positive
Explore how to solve the first missing positive integer problem efficiently using cyclic sort. This lesson guides you through an O(n) time and O(1) space algorithm that places numbers in their correct positions to identify the smallest missing positive number. Understand the reasoning behind ignoring negatives, the two-pass approach, and how cyclic sort optimizes performance over naive methods.
Statement
Given an unsorted integer array, nums, return the smallest missing positive integer.
Create an algorithm that runs with an time complexity and utilizes a constant amount of space.
Note: The smallest missing positive isn’t the first positive number that’s missing in the range of elements in the input, but the first positive number that’s missing if we start from .
Constraints:
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nums.length -
...