题目如下: 解题思路:这题看起来和[leetcode]448. Find All Numbers Disappeared in an Array很相似,但是有几点不同:一是本题的输入存在负数,二是没有约定输入元素的最大值.那么,怎么可以把本题转换成448题的场景呢?首先,我们可以求出输入数组nums中所有正整数的数量,记为p,那么显然能得出这个结论:1 <=answer < p+1.然后,我们可以通过交换把所有值不在这个区间内的元素值移动到数组的后半部分.记nums前半部分[0:length]…

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. 解法一:O(nlogn) time and O(1) sp…

一天一道LeetCode系列 (一)题目 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. (二)解题 /* 首先对初始vector进行排序,然后设定…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 41: First Missing Positivehttps://oj.leetcode.com/problems/first-missing-positive/ Given an unsorted integer array, find the first missing positive integer.For example,Given [1,2,0] return…

41. 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. My Thought 题目大意 给定一个数组,…

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. 题意分析: 本题是给一个整数的数组,让你按顺序找出第一个缺失的正整数.也就是说从1开始查找,找到了1再找…

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. [题目分析] 给定一个整数数组,找出数组中第一个缺失的正整数.比如[1,2,0]缺少3,[3,4,-1,…

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. 题意: 给定了一个无序数组,要求找到第一个缺失的正整数.如1,2,4,5的第一个缺失的正整数是3.要求时…

package y2019.Algorithm.array; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array * @ClassName: SortArrayByParity * @Author: xiaof * @Description: 905. Sort Array By Parity * Given an array A of non-negative integers, return an array…

[LeetCode]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. 找到第一个没有出现的正整数 思路:…