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摘要： Description Given a non empty, singly linked list with head node , return a middle node of linked list. If there are two middle nodes, return the seco 阅读全文

摘要： The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calcul 阅读全文

摘要： Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have ex 阅读全文

摘要： Given a word, you need to judge whether the usage of capitals in it is right or not. We define the usage of capitals in a word to be right when one of 阅读全文

摘要： S and T are strings composed of lowercase letters. In S, no letter occurs more than once. S was sorted in some custom order previously. We want to per 阅读全文

摘要： 题目比较简单，实现一个复数乘法，输入输出都要求为字符串形式 大部分时间都花在写正则匹配实部和虚部了 两个复数 $a + bi$, $c + di$ $(a + bi) (c + di) = (ac bd) + (bc + ad)i$ 使用三个辅助变量 $$\begin{cases} t_1 = (a 阅读全文

摘要： Description International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as follows: "a" maps to " 阅读全文

摘要： Description In a 2 dimensional array grid, each value grid[i][j] represents the height of a building located there. We are allowed to increase the hei 阅读全文

摘要： 1. Variable definitions : training examples' count $X$ : design matrix. each row of $X$ is a training example, each column of $X$ is a feature $$X = \ 阅读全文

摘要： 1. uninstall software install by yum install install by to uninstall this type 2. 同步系统时间 查看系统时间 同步系统时间 ntp常用服务器： 中国国家授时中心：210.72.145.44 NTP服务器(上海) ：nt 阅读全文

摘要： 1. 修改redis设置 redis默认处在protection mode, 修改 , , 或者给redis设置密码， 将 这一行用 注释掉 2. 修改爬虫设置 向 加入以下设置 为master的ip加上redis的端口号 3. 修改爬虫代码 使爬虫继承自RedisSpider 增加一个 属性，这个 阅读全文

摘要： 0. 安装依赖 1. 安装 python 3.6.4 下载源代码并编译 检查python3.6.4是否安装成功 可以看到python3.6，pip3.6 修改软链接 这是未修改时的/usr/bin 只修改python3，这样就不会影响yum和其他程序的运行 2. install Twisted 3. 阅读全文

摘要： 1. Variable definitions : training examples' count $y$ : $X$ : design matrix. each row of $X$ is a training example, each column of $X$ is a feature $ 阅读全文

摘要： 1.range(x,y) [x,y) 2.dics 当key在dics中不存在时返回default的值，返回一个函数也是可以的 判断key在dic中是否存在 两种方法 foreach一个dic 单独循环key或者values 3.读写文件 python中文件被分为两种,text or binary 阅读全文

摘要： 1. 配置git客户端 1.1 安装git bash "https://git scm.com/downloads" 1.2 设置ssh Key 查看是否有ssh key 没有则生成ssh key 将生成的公钥 (.pub为后缀) 上传到git网站上 1.3 设置用户名和邮箱 2. 管理项目 2.1 阅读全文