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 · Given an unsorted array arr [] with both positive and negative elements, find the smallest positive number missing from the array. Examples: Explanation: 3 is the smallest positive number missing from the array. Explanation: 4 is the smallest positive number missing from the array. The key insight comes from recognizing that the smallest missing positive integer must be bounded. If we have an array of length n, the smallest missing positive can only be in the range [1, n+1].
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