https://leetcode.com/problems/first-missing-positive/ 给定一个长度为len的无序数组nums,找到其第一个丢失的正整数. 解法: 使用cyclic swapping algorithm.将满足条件  0 < num <= nums.size()的num放到下标为num的位置上,最终第一个nums[i]!=i的i即是最小的丢失的正整数. 代码将num放在下标为num-1的位置,思想是一样的. 注意交换的条件,避免死循环. class Solu…

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. SOLUTION 1: 使用类似桶排序的方法: 将值放在它…

Given an array of integers, find the first missing positive integer in linear time and constant space. In other words, find the lowest positive integer that does not exist in the array. The array can contain duplicates and negative numbers as well. F…

spring boot 2.0.3启动报错: Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2018-10-24 14:49:06.108 ERROR 14932 --- [ main] o.s.boot.SpringApplication : Application run failed org.springfra…

原文见:https://leetcode.com/problems/couples-holding-hands/discuss/113362/JavaC%2B%2B-O(N)-solution-using-cyclic-swapping 一.问题引入 假设有一个长度为N的数组nums包含0—N-1的所有数字,但是数组中数字的顺序是随机的.可以任选两个数字进行交换,问最少要用多少步能够使数组满足 i==nums[i](即使数组递增有序). 二.Cyclic Swapping 使用cyclic sw…

错误    3    error C4430: missing type specifier - int assumed. Note: C++ does not support default-int #include "stdafx.h"没有放在其他头文件之前.…

最近打包上传是遇到一个问题: 描述: Missing Push Notification Entitlement - Your app includes an API for Apple's Push Notification service, but the aps-environment entitlement is missing from the app's signature. To resolve this, make sure your App ID is enabled for…

最近在写一个网页的时候,需要用到PHPmailer来发送邮件,按照官网上给出的demo写出一个例子,却报错Extension missing: openssl 最后发现需要修改php.ini中的配置: 将其中的 extension=php_openssl.dll 打开即可. demo代码添加如下: <?php require 'PHPMailerAutoload.php'; $mail = new PHPMailer; //$mail->SMTPDebug = 3; // Enable ver…

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 you implement it u…

Given a sorted integer array where the range of elements are [0, 99] inclusive, return its missing ranges.For example, given [0, 1, 3, 50, 75], return [“2”, “4->49”, “51->74”, “76->99”] 这道题让我们求缺失区间,跟之前那道Summary Ranges很类似,这道题让我们求缺失的空间,给了一个空间的范围[lo…