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【题解】#373. 「USACO1.1」Friday the Thirteenth 题解(2023-07-01更新)
# #373. 「USACO1.1」Friday the Thirteenth 题解 ## **[题目传送门](https://qoj.fzoi.top/problem/373)** **欢迎大家指出错误并联系这个蒟蒻** ## 更新日志 - **2023-02-01 17:20 文章完成** - ......
Table flags are 0 in the data dictionary but the flags in file ./ibdata1 are 0x4800!
# 1、问题截图 cat /var/log/mysql/error.log ``` sql 2019-01-28T09:49:57.076019Z 0 [ERROR] [FATAL] InnoDB: Table flags are 0 in the data dictionary but the f ......
Wild Patterns: Ten Years After the Rise of Adversarial Machine Learning---reading
# Wild Patterns: Ten Years After the Rise of Adversarial Machine Learning reading - 攻击目标 - 安全破坏 - 完整性破坏: 逃避检测,而不影响正常的系统运行 - 可用性破坏: 使得合法用户不能正常使用系统 - 隐私 ......
The proxy difference between mitmproxy and fiddle
# Description 1. A bank webside , I can caught the https flows when to use fiddle ; 2. And I caught fail of the https flows when to use mitmproxy , - ......
Educational Codeforces Round 151 F. Swimmers in the Pool
### 一.前言 本来打算打打这个比赛玩玩,结果同学找我打游戏王去了,就没打现场(逃) 因为是一道不错的数学题,来写写补题的题解 这里点名批评 @[HOLIC](https://codeforces.com/profile/HOLlC) 喂给我的假题意,让我查错大半天,最后发现题意错了还重新推了好多 ......
15.面向对象和super
## 面向对象和super() **类(Class):** 具有相同的属性和方法的对象的集合,即定义对象的模板 **对象(Object):** 类的实例化对象,有自己的属性和方法。 **类方法:** 使用装饰器**@classmethod** ,传递类的属性和方法(不能传实例的属性和方法) **类属 ......
E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied) E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?
错误: E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied) E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/ ......
Vue3 vite:is a JavaScript file. Did you mean to enable the 'allowJs' option?
描述 今天在vue3+vite下进行打包时,突然vscode报了一个error。 大概的意识是询问是否启用“allowJS”选项,因为该文件在程序内是指定用于编译的根文件。 提示信息已经很明确了,下面从网上摘抄了下什么是 allowJS 选项。 allowJs是1.8中新提供的选项。TypeScri ......
Cross-thread operation not valid: Control 'txtMessage' accessed from a thread other than the thread it was created on.
Winform TextBox Cross-thread operation not valid: Control 'txtMessage' accessed from a thread other than the thread it was created on. (330条消息) 解决Cros ......
CentOS7 开机异常Failed to open /sysroot/etc/fstab:Input 和 mysql无法启动 Ignoring the redo log due to missing MLOG
出现问题,系统进不去; 参考: 亲测有效 https://blog.csdn.net/Nightwish5/article/details/119640728 ......
Java通配符? extends SomeClass或? super SomeClass
通配符的使用是用于具体的泛型对象或者类型声明,而非具体的类型定义; 比如List<? extends Foo> list,它表示list对象(或者形参对象或返回值)是一个生产者,它只能给外部提供泛型数据,即可以调用list.get()方法,而无法调用list.add(T xx)方法 ,因为能调用li ......
ic power-supply pin notions
Typical supply-pin labeling NPN BJT[b] N-FET AC/DC[c] DC DC Positive supply voltage VCC/VBB VDD V+ VS+ VIN VDD VA Negative supply voltage VEE VSS V− V ......
讲座笔记2:Fairness with Censorship: Bridging the Gap between Fairness Research and Real-world Deployment
Fairness with Censorship: Bridging the Gap between Fairness Research and Real-world Deployment 主讲人:Wenbin Zhang Censorship: 会有信息的缺失 原因: Study ends - n ......
Tips: How to Get the Currently Selected HTML Content in Major Browsers
```js function getSelectionHtml() { const sel = window.getSelection(); if (sel.rangeCount) { var container = document.createElement("div"); for (var i ......
npm install报gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.没有python环境
1 gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable. 2 gyp ERR! stack at PythonFinder.failNoPython (/Us ......
面向对象(三大特征、继承下的查找、super、组合)
面向对象有三大特征:封装、继承和多态 继承 继承其实和封装差不多,就是新建的类称为是子类或派生类,多个子类继承同一个类,这个类教父类或基类 1.为什么要继承 类解决什么问题:解决的是对象与对象之间代码冗余问题 继承解决什么问题:解决的是类与类之间的代码冗余问题 2.怎样继承 新式类:继承了objce ......
mysql: [Warning] Using a password on the command line interface can be insecure.
https://zhuanlan.zhihu.com/p/542166965 ......
java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '}' at line 1
# 问题 报错代码 ``` org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: java.sql.SQLSyntaxErrorException: You have an err ......
面向对象之单继承下的属性查找,多继承下的属性查找,super关键字的使用,多态与多态性(理论),组合
### 单继承下的属性查找 ```python # 单继承的意思是一个类只继承一个类 class D(): pass class C(D): pass class B(C): pass class A(B): pass """python支持多继承""" class D(): pass class ......
MySqlException(0x80004005) Reading from the stream has failed 远程主机强迫关闭了一个现有的连接
不同客户端电脑连接服务器数据库,通过navicat管理工具可以正常连上,但是通过程序连接提示MySqlException(0x80004005) Reading from the stream has failed 远程主机强迫关闭了一个现有的连接(注意:部分电脑通过程序也是可以正常连接服务器数据库 ......
Hack The Box-Starting Point-Crocodile
## 答案: 1. 任务1:What Nmap scanning switch employs the use of default scripts during a scan? `-sC` ![image](https://img2023.cnblogs.com/blog/1367845/2023 ......
gdb.exe: warning: Couldn't determine a path for the index cache directory.
GDB 调试中出现的警告 D:\\gitee\\luatos-soc-2022\\out\\example_copy> arm-none-eabi-gdb example.elf C:\\SysGCC\\bin\\arm-none-eabi-gdb.exe: warning: **Couldn't ......
181_带你体验 Power BI 开发者模式 pbip
# 181\_带你体验 Power BI 开发者模式 pbip ## 一、背景 如果你是一个 Power BI 重度用户,你是不是也有如下的情况? ![图-01](https://image.jiaopengzi.com/blog/202306280958012.png) 是的,Power BI 的 ......
【GiraKoo】VS提示Some bytes have been replaced with the Unicode substitution character
# 【问题解决】VS提示Some bytes have been replaced with the Unicode substitution character VS提示Some bytes have been replaced with the Unicode substitution char ......
Hack The Box-Starting Point-Sequel
## 答案 1. 任务1:During our scan, which port do we find serving MySQL? `3306` ![image](https://img2023.cnblogs.com/blog/1367845/202306/1367845-20230628121 ......
Mysql用户建立触发器报错You do not have the SUPER privilege and binary logging is enabled
分析原因:是log_bin_trust_function_creators值为off导致,因为Table中有Trigger,如果不创建Trigger,不会出现这样的错误信息,但Trigger必须创建临时解决办法:用root用户登录: mysql -u root -pmysql>set global ......
has been blocked by CORS policy: The request client is not a secure context and the resource is ...
该报错原因为:Chrome浏览器禁止外部请求访问本地,被CORS策略阻止解决方案:1、打开chrome的设置: chrome://flags/#block-insecure-private-network-requests2、将 Block insecure private network requ ......
单继承、多继承下的属性查找、super关键字、多态与多态性、组合
单继承下的属性查找 单继承:一个类只能继承一个类。 class C(): pass class B(C): pass class A(B): # 单继承 pass 单继承下的属性查找顺序: 先从对象本身的名称空间中查找 > 产生这个对象的类中去查找 >继承的父类中去查找 # 查找属性 class F ......
Hack The Box-Starting Point-Appointment
## 答案 1. 任务1:What does the acronym SQL stand for? `Structured Query Language` ![image](https://img2023.cnblogs.com/blog/1367845/202306/1367845-2023062 ......
(C#) IIS 响应标头过滤敏感信息(如:Server/X-Powered-By等) 运维知识
背景: 再一次净网行动中,客户要求安全改造发现了接口请求的header标头中出现如图中的敏感信息。 说明: 其意义在于告知浏网站是用什么语言或者框架编写的。解决办法就是修改该响应头为一个错误的值,将攻击者导向一个错误的方向。 准备: 这里只说windows 的iis环境,不考虑其他服务器的环境。首先 ......