这样就代替了解法二中的tag数组了。 classSolution {public:intfirstMissingPositive(intA[],intn) {if(n ==0)return1;//if A[i] is negative, i+1 exists in original A//partition, non-negative onlyintlow =0;inthigh = n-1;intend =
代码2(直接在原数组上进行交换, 空间代价为o(1)) classSolution {public:intfirstMissingPositive(vector<int>&nums) {if(nums.empty())return1; auto begin=getFirstPositivePos(nums);if(*begin <0)return1;for(auto it = begin; it !=nums.end(); ) { auto realPos= begin + *it -1;if(realPo...
解题思路:先讲数组放到map中,然后依次对比map中是否存在i,如果不存在就返回结果 classSolution(object):deffirstMissingPositive(self,nums):""":type nums: List[int]:rtype: int"""ifnums[0]==1andnums[len(nums)-1]==len(nums)andsum(nums)==len(nums)*(len(nums)+1)/2:returnlen(nums)+1num_m...
[LeetCode] 41. First Missing Positive ☆☆☆(第一个丢失的正数),Givenanunsortedintegerarray,findthesmallestmissingpositiveinteger.Examp
LeetCode "First Missing Positive" Similar with "Longest Consecutive Sequence". Another usage to hashset. Take care of corner cases! classSolution {public:intfirstMissingPositive(intA[],intn) {if(n ==0)return1; unordered_set<int>set;intminPos = std::numeric_limits<int>::max();for(inti ...
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. ...
publicclassSolution{/** * 157 / 157 test cases passed. * Status: Accepted * Runtime: 14 ms * * @param nums * @return */publicintfirstMissingPositive(int[]nums){for(inti=0;i<nums.length;i++){if(nums[i]!=i+1){// swap nums[i] with nums[nums[i] - 1]intcur=nums[i]-1;if...
publicclassSolution{ publicintfirstMissingPositive(int[]nums){ if(nums==null||nums.length==0){ return1; } // 创建一个查找表,用来记录 1~nums.length 中数字出现的情况 boolean[]exist=newboolean[nums.length]; for(inti=0;i<nums.length;i++){ ...
public class Solution { public int firstMissingPositive(int[] nums) { for (int i = 0; i < nums.length; ) { int n = nums[i]; if (n >= 1 && n <= nums.length + 1 && nums[n - 1] != n) {//这个数在答案区间 int tmp = nums[n - 1]; ...
技术标签: 牛客网-Leetcode148道第一个缺失的正整数 first-missing-positive 题目描述 给出一个无序的整数型数组,求不在给定数组里的最小的正整数 例如: 给出的数组为[1,2,0] 返回3, 给出的数组为[3,4,-1,1] 返回2. 你需要给出时间复杂度在O(n)之内并且空间复杂度为常数级的算法 Given an ...