leetcode problem 41 -- First Missing Positive Given an unsorted integer array, find the first missing positive integer. For example, Given[1,2,0]return3, and[3,4,-1,1]return2. Your algorithm should run inO(n) t
1classSolution {2func firstMissingPositive(_ nums: [Int]) ->Int {3ifnums.count ==0{return1}4varnums =nums5foriin0..<nums.count {whilenums[i] >=1&& nums[i] <= nums.count && nums[nums[i] -1] != nums[i] {nums.swapAt(i, nums[i] -1)}}6foriin0..<nums.count {ifnums[i...
Given an unsorted integer arraynums, return the smallest missing positive integer. You must implement an algorithm that runs inO(n)time and uses constant extra space. Example 1: Input: nums = [1,2,0] Output: 3 Example 2: Input: nums = [3,4,-1,1] Output: 2 Example 3: Input: nums...
为了减少时间复杂度,可以把 input 数组都装到 map 中,然后 i 循环从 1 开始,依次比对 map 中是否存在 i,只要不存在 i 就立即返回结果,即所求。 参考代码 packageleetcodefuncfirstMissingPositive(nums[]int)int{numMap:=make(map[int]int,len(nums))for_,v:=rangenums{numMap[v]=v}forindex:=1;index...
[LeetCode] 41. First Missing Positive ☆☆☆(第一个丢失的正数),Givenanunsortedintegerarray,findthesmallestmissingpositiveinteger.Examp
Given an unsorted integer array, find the smallest missing positive integer. 给定一个未排序的整数数组,找出其中缺少的最小的正整数。 Example 1: Input: [1,2,0] Output: 3 Example 2: Input: [3,4,-1,1] Output: 2 Example 3: Input: [7,8,9,11,12] ...
今天是一道在LeetCode上标记为Hard的题目,Acceptance为22.9%的题目,虽然知道思路之后会发现其实较为简单。 题目如下: Given an unsorted integer array, find the first missing positive integer. For example,Given[1,2,0]return3, and[3,4,-1,1]return2. ...
LeetCode:First Missing Positive LeetCode 题目链接:First Missing Positive Given an unsorted integer array, find the first missing positive integer. For example, Given [1,2,0] return 3, and [3,4,-1,1] return 2. Your algorithm should run in O(n) time and uses constant space....
public int missingNumber(int[] nums) { int res = 0; for(int i = 0; i <= nums.length; i++){ res ^= i == nums.length ? i : i ^ nums[i]; } return res; } } First Missing Positive Given an unsorted integer array, find the first missing positive integer. ...
First Missing Positive LeetCode上的41题:https://leetcode-cn.com/problems/first-missing-positive/description/ First Missing Positive 题目 题解 代码 题目 Given an unsorted integer array, find the smallest missing ...41. First Missing Positive(最小未出现正数) 给定一个未排序的整数数组,找到最小的...