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.
\n
Example 1:
\n\n\nInput: nums = [1,2,0]\nOutput: 3\nExplanation: The numbers in the range [1,2] are all in the array.\n\n\n
Example 2:
\n\n\nInput: nums = [3,4,-1,1]\nOutput: 2\nExplanation: 1 is in the array but 2 is missing.\n\n\n
Example 3:
\n\n\nInput: nums = [7,8,9,11,12]\nOutput: 1\nExplanation: The smallest positive integer 1 is missing.\n\n\n
\n
Constraints:
\n\n1 <= nums.length <= 105-231 <= nums[i] <= 231 - 1给你一个未排序的整数数组 nums ，请你找出其中没有出现的最小的正整数。
O(n) 并且只使用常数级别额外空间的解决方案。\n\n\n\n
示例 1：
\n\n\n输入：nums = [1,2,0]\n输出：3\n解释：范围 [1,2] 中的数字都在数组中。\n\n
示例 2：
\n\n\n输入：nums = [3,4,-1,1]\n输出：2\n解释：1 在数组中，但 2 没有。\n\n
示例 3：
\n\n\n输入：nums = [7,8,9,11,12]\n输出：1\n解释：最小的正数 1 没有出现。\n\n
\n\n
提示：
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"exampleTestcases": "[1,2,0]\n[3,4,-1,1]\n[7,8,9,11,12]",
"__typename": "QuestionNode"
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