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CF1824B2 LuoTianyi and the Floating Islands (Hard Version) - 概率期望 - 树的重心 -
题目链接：https://codeforces.com/contest/1824/problem/B2 题解： 考虑一棵 $n$ 个点的树，假如已经选定了 $k$ 个特殊点，如何判断某一个点是否为好点？ 显然将这个点提到根没有影响，那么好点的充要条件是对于所有子树的 $S_u$ 值都 $\leq k ......
X-Powered-By: ARR/3.0 是什么
背景： 项目调用了一个内部接口，查看接口返回的内容，看到X-Powered-By: ARR/3.0，出于好奇百查了一下 Application Request Routing (ARR) is a feature in IIS that allows you to set up a web farm ......
230509 TI- Engineer It - How to test power supplies - Measuring Stability
Hi, my name is Bob Hanrahan, Application Engineering at Texas Instruments, and this is a series on measuring performance of power supplies. Here we'll ......
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 '?' 问题的解决
问题描述 显示在条件查询的sql语句那里报错 问题解决 本来我是习惯了使用servlet写数据库操作的，然后就直接忽略掉了，或者说，直接忘记了在jsp里面的sql语句怎么正确书写了； 经过查阅资料发现，查询语句是这样写的： String sql="select * from book where i ......
177_模型_Power BI 进销存6大日期维度期初与期末
177_模型_Power BI 进销存6大日期维度期初与期末 一、背景 在经销存报表设计中，经常会遇到的便是期初与期末。当然我们这里说期初与期末指的是期初库存与期末库存。 这里的期一般常见的会有：年月日。本案例将演示 6 大日期维度，分别是：日、周、月、季度、半年度、年度。 先来看一下示例结果(** ......
java.lang.IllegalStateException: Failed to check the status of the service 的解决办法
参考资料 java.lang.IllegalStateException: Failed to check the status of the service 的解决办法_Hello_World_QWP的博客-CSDN博客 环境条件 spring cloud，注册中心用的是zookeeper； 报错 ......
CF1824B2 LuoTianyi and the Floating Islands题解
是 Div2 的 D1 和 D2。 题意 给定一棵 $n$ 个结点的树，现在有 $k(k\leq n)$ 个结点上有人。 一个结点是好的当且仅当这个点到所有人的距离之和最小。 求在这 $n$ 个点中随机取 $k$ 个点时，好的结点的期望个数，对 $10^9+7$ 取模。 Easy: $k\leq 3 ......
IBM Power 内存缺失问题
转自：http://blog.chinaunix.net/uid-22759617-id-3456302.html IBM P5小型机内存缺失问题处理方法总结 p55A机器有2G的内存无法检测出来。机器型号：9133－55A<1>联系前方找一根网线，一头连接55A小型机后端的HMC1口，一头连接电脑 ......
CF1825C LuoTianyi and the Show
传送门(luogu) 传送门(CF) 前言 ~~我来水题解力~~ 简化题意 $n$ 个人，$m$ 个座位，每个人落座的方法有三种： 坐最左边的人的左边，没人的话就做 $m$ 号座位，若最左边的为 $1$ 号，就离开； 坐最右边的人的右边，没人的话就做 $1$ 号座位，若最右边的为 $m$ 号，就离开 ......
ibm power 内存条 顺序 P740 P720 740
https://www.renrendoc.com/paper/175507929.html ......
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager......
pip install -r requirements.txt 报错"WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system ......
解决git错误: error: The following untracked working tree files would be overwritten by merge
在我本地上进行git pull的时候，出现这个错误： error: The following untracked working tree files would be overwritten by merge: config/config.php 这是因为，本地上有一个文件，没有被git管理，但 ......
The 16th Harbin Engineering University Collegiate Programming Contest
The 16th Harbin Engineering University Collegiate Programming Contest A. stral Reflection 用右界覆盖左界为下标的数组 构成一个以i为左界，a[i]为右界的数组 以此表示区间 对于每一个陨石都尽可能找左界<=自己 ......
How to use Linux command to find out the background process All In One
How to use Linux command to find out the background process All In One
......
The connection to the server localhost:8080 was refused - did you specify the right host or port?
遇到如下问题： [root@k8s-node1 ~]# kubectl get podThe connection to the server localhost:8080 was refused - did you specify the right host or port? 解决方式： cd ......
Exploring the Use of Humanized Mouse Models in Drug Safety Evaluation
However, there are differences between animals and humans, safety studies cannot be conducted on animal models alone, and normal animals do not respon... ......
[ERROR] [MY-012263] [InnoDB] The Auto-extending innodb_system data file './ibdata1' is of a different sizethan specified in the .cnf file: initial 65536 pages, max 0 (relevant if non-zero) pages!
实际my.cnf发现里面的innodb_data_file_path = ibdata1:1G:autoextend 设置得太大，我这机器容量小，所以调到12M ， innodb_data_file_path = ibdata1:12M:autoextend ......
Mixed Content: xxx This request has been blocked; the content must be served over HTTPS
1.情景展示 这是教师资格证，准考证的下载界面。 当我们去点击“下载准考证”的时候，你将发现点击该按钮并没有反应。 按F12，打开开发者工具。 该网站，会自动进入断点调试模式，目的是为了：禁止前端开发者查看网页代码之类的吧。 我们要想看看，为什么无法下载准考证，就不能够被它拦住。 解决办法： 第一步 ......
安装SQL Server累积版本更新包，提示“Not Clustered or the Cluster service is up and online”和 There are no SQL Server Instances or shared features that can be updated on this computer
1. Not Clustered or the Cluster service is up and online 起因是服务器SQL Server之前有开启SQL Server AlwaysOn High availability feature and installed Failover Clu ......
解决Could not find a version that satisfies the requirement思路
安装python第三方库的时候会提示报错缺少依赖库，报错如下： ERROR: Could not find a version that satisfies the requirement 模块名 (from automat) (from versions: none)ERROR: No match ......
GYM103743H Super Gray Pony - 思维 -
题目链接：https://codeforces.com/gym/103743/problem/H 这应该是近期做出来的最难的题之一了……想了一个多小时 首先，如何由 $S$ 求得 $a^{(n)}(S) $ ？ 考虑 $S$ 的每一位 0/1 如果第一位是 1，那么相当于就知道了剩下的数字在 $re ......
176_工具_Power BI 实用工具 pbi-utils 更新至 v1.0.3.1
176_工具_Power BI 实用工具 pbi-utils 更新至 v1.0.3.1 pbi-utils 更新至：v1.0.3.1, 从 v1.0.0.0 到 v1.0.3.1 更新了 8 次。 文档地址：https://jiaopengzi.com/2880.html 主要功能： 快速设置 Po ......
git文件时出现gnutls_handshake() failed: The TLS connection was non-properly terminated.
使用 git config --global --unset https.https://github.com.proxy git config --global --unset http.https://github.com.proxy 重置github代理 ......
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts
报错原因： ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the f ......
typora:The beta version of typora is expired, please download and install a newer version
该解决方案摘录自：摘录 问题描述 typora安装后提示 The beta version of typora is expired, please download and install a newer version 解决方案 按Windows+R打开运行窗口，输入regedit，点确定，打开 ......
关于Kubernetes-v1.23.6-初始化时报错[kubelet-check] It seems like the kubelet isn't running or healthy
笔者今天在对k8s，v1.23.6版本的的master节点使用如下命令进行初始化时 [root@k8s-master qq-5201351]# kubeadm init \ > --apiserver-advertise-address 192.18.106.87 \ > --image-repos ......
20230507 TI Engineer It - How to test power supplies - Measuring Noise
Hi. I'm Bob Hanrahan application engineering at Texas Instruments.This is a series on measuring performance of power supplies .we will be measuring no ......
ocidll forced to load library，initialization error could not initialize make sure you have the 64 bits oracle client installed
是因为你使用pl/sql是64位的，但是软件只找到了32位的oracle 客户端 多次尝试，我的pl/sql是64位，但是这里需要对应的使用64位，我的方案是下载 https://www.allroundautomations.com/registered-plsqldev/ 这个版本的软件 这样配 ......
安装msi软件报错：The installer has encountered an unexpected error installing this package.The error code is 2503
因为安装权限不足 以管理员身份运行cmd 运行安装命令 msiexec /package "E:\xxx\charles-proxy-4.6.4-win64.msi" ......
使用nacos配置，启动服务时一直报 Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. APPLICATION FAILED TO START
报错日志如下： Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.-2023-05-05 09:46:02.328 [TID ......