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Grokking the Coding Interview Patterns in C++

First Missing Positive

Explore how to identify the smallest missing positive integer from an unsorted array by applying cyclic sort. This lesson guides you through designing an algorithm with O(n) time complexity and constant space, helping you understand problem constraints and develop efficient coding solutions.

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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 1 ...