First Missing Positive -- LeetCode 原题链接: http://oj.leetcode.com/problems/first-missing-positive/ 这道题要求用线性时间和常量空间,思想借鉴到了Counting sort中...[Leetcode] First Missing Positive First Missing Positive Given an u
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 = n-1;while(low <=high) {while(low <= high && A[low] >0) low++;//to here,//case...
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) time and uses constant space. 通过swap操作,把各个元素swap到相应的位置上,然后再扫描一遍数组,确定丢失的正数的位置 1classSolut...
First Missing Positive -- LeetCode 原题链接: http://oj.leetcode.com/problems/first-missing-positive/ 这道题要求用线性时间和常量空间,思想借鉴到了Counting sort中...[Leetcode] First Missing Positive First Missing Positive Given an unsorted integer array, find the first missing positive integer....
https://leetcode-cn.com/problems/first-missing-positive/ Given an unsorted integer array, find the smallest missing positive integer. 题意 给你一个未排序的整数数组,请你找出其中没有出现的最小的正整数 。你的算法的时间复杂度应为O(n),并且只能使用常数级别的额外空间。
int firstMissingPositive(vector<int>& nums) { int n = nums.size(); for(int i = 0; i < n; i++){ while(nums[i] != i + 1){ if(nums[i] <= 0 || nums[i] > n || nums[i] == nums[nums[i]-1]) break; swap(nums[i], nums[nums[i]-1]); ...
class Solution { public: int firstMissingPositive(vector<int>& nums) { int n = nums.size(); for (int i = 0; i < n; ++i) { // 将nums[i]放到正确的位置,直到无法交换为止 while (nums[i] >= 1 && nums[i] <= n && nums[nums[i] - 1] != nums[i]) { swap(nums[i], nums...
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.
-231<= nums[i] <= 231- 1 题目大意:找到第一个缺失的正整数 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...
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....