First Missing Integer - Latest Information & Updates 2026

Web Reference: Given an unsorted integer array nums. Return the smallest positive integer that is not present in nums. You must implement an algorithm that runs in O(n) time and uses O(1) auxiliary space. Example 1: Output: 3. Explanation: The numbers in the range [1,2] are all in the array. Example 2: Output: 2. Jul 23, 2025 · The first place where the number doesn’t match its index gives us the first missing positive number. If all the numbers from 1 to n, are at their correct indexes, then the next number i.e., n + 1, is the smallest missing positive number. After this rearrangement, we scan through the array to find the first position where the value doesn't match its expected position plus one. This gives us the smallest missing positive integer.

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Last Updated: April 5, 2026

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