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Grokking the Coding Interview Patterns in Go

Solution: First Missing Positive

Explore how to identify the smallest missing positive integer from an unsorted array using the cyclic sort pattern. Understand the algorithm's steps to position elements correctly with constant space and linear time complexity, enabling you to solve this common coding interview problem efficiently.

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Statement

Given an unsorted integer array, nums, return the smallest missing positive integer. Create an algorithm that runs with an O(n)O(n) 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 11.

Constraints:

  • 1≤1 \leq nums.length ≤105\leq 10^5 ...