传送门 题目大意 给你一个数n和长度为n的序列,序列中的每个数均为1或-1,如果一个点j对于任意的k都满足题目中给的式子,则j是一个合法位置,问这样的j有多少个 分析 这道题有两种方法,分别对应代码1和代码2. 方法1 我们发现最终答案实际就是这n个数的和与0去最大值,因为我们不难发现对于任意两个相邻的1和-1它们的存在是没有意义的,因为这两个位置肯定不合法,而它们的和为0,对其它位置没有影响.所以在得到这些后我们只需把相邻的1和-1不断删掉就行了,因此可以证明之前的猜想. 方法2 我们发现对于…

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. 这道题让我们找缺失的首个正数,由于限定了O(n)的时间,所以一般的排序方法都不能用,最开始我没有看到还限…

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. 给定无序整型数组,找出第一个不在数组里的正整数,要求时间复杂度为O(n),空间复杂度为O(1) 本题使用…

Given an array with positive and negative integers. Re-range it to interleaving with positive and negative integers. Note: You are not necessary to keep the original order of positive integers or negative integers. Example Given [-1, -2, -3, 4, 5, 6]…

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. 通过swap操作,把各个元素swap到相应的位置上,然后再…

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. 思路: 又是一个不让排序,但是要得到跟排序有关信息的.想了半天,只能空间换时间,可是又只能用常量空间,这…

41. First Missing Positive Problem's Link ---------------------------------------------------------------------------- Mean: 给你一组整数,找出第一个空缺的正整数. 要求:时间O(n),空间O(n). analyse: 这题时间O(n)想了半天没想到,用O(n*logn)过的. 然后看了discuss,想法非常巧妙,自愧不如. Time complexity: O(N) v…

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. 分析: 因为数组的大小为n,因此那个缺失的整数只可能的范围[1,n+1] 方法一:需要O(n)的空间,设…

Negative and Positive (NP) Time Limit: 3000/1500 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 2177    Accepted Submission(s): 556 Problem Description When given an array (a0,a1,a2,⋯an−1) and an integer K, you are…

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. 解题思路一: 刚看到题目的时候感觉无从下手,后来仔细理解题意,需要找到first missing p…

Given an array with positive and negative integers. Re-range it to interleaving with positive and negative integers. Example Given [-1, -2, -3, 4, 5, 6], after re-range, it will be[-1, 5, -2, 4, -3, 6] or any other reasonable answer. Note You are not…

题目来源 https://leetcode.com/problems/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…

URL: http://www.ibiomedical.net/pigsps/ keywords: pig, boar, SNP, positive selection, database, db, pigsps…

题目链接:Funny Positive Sequence 题意:给出一个数列,如果它的前i(1<=i<=n)项和都是正的,那么这个数列是正的,问这个数列的这n种变换里, A(0): a1,a2,…,an-1,an A(1): a2,a3,…,an,a1 … A(n-2): an-1,an,…,an-3,an-2 A(n-1): an,a1,…,an-2,an-1 有多少是正的数列. 思路:比赛的时候想了很久很久,肯定是要求在一次线性扫描里solve这个两重循环才能解决的问题,最后想到应该是计算…

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. 这道题求的是在一个乱序数组中缺少的第一个正数,要求时间复杂度o(n)空间复杂度为1. 先上代码 pack…

题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5183 Negative and Positive (NP) Description When given an array $\left( {{a_0},{a_1},{a_2}, \cdots {a_{n - 1}}} \right)$ and an integer $K$, you are expected to judge whether there is a pair $(i,j)\ (0 \…

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. 代码: class Solution { public: int firstMissingPos…

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.(Hard) 分析: 如果题目要求是O(n^2)时间复杂度,O(1)空间复杂度,或O(n)时间复杂…

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. 链接:   http://leetcode.com/problems/first-missing…

题目描述: 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. 解题思路: 参考http://blog.csdn.net/nanjunxiao/articl…

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…

1294 - Positive Negative Sign   PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB Given two integers: n and m and n is divisible by 2m, you have to write down the first n natural numbers in the following form. At first take f…

sql 语句拼接报错: No signature of method: java.lang.String.positive() is applicable for argument types: () values: [] 原因:字符串相加时,加号前后有空格 例如(这样是不行的): sql =+ "and c.efficientStatus = "+courseStatus //错误 要把加号后面的空格去掉就行了,简直了. 这是自己学习过程中的记录,方便自己回顾,好记性不如烂笔头. 作…

2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder. What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20? 程序比较好编,就是考验计算机.最大范围也是预估的,边写边调. 尽管算对了,但方式可能不对.…

E. Strictly Positive Matrix   You have matrix a of size n × n. Let's number the rows of the matrix from 1 to n from top to bottom, let's number the columns from 1 ton from left to right. Let's use aij to represent the element on the intersection of t…

Question 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. Solution 1 -- HashSet Note the problem is t…

# -*- 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…

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. 题目意思: 返回第一个缺失的正数. 时间复杂度应该在O(n…

268. Missing Number Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array. For example,Given nums = [0, 1, 3] return 2. Note:Your algorithm should run in linear runtime complexity. Could…

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…