average keep high the
redis cluster 多节点部署时出现Waiting for the cluster to join
如图显示一直卡在这里： 可能由一下几种情况 1、redis.conf 中的bind 配置问题 可能配置有问题限制的访问redis ,通常设置为本机IP ，或者可以设置为 0.0.0.0 进行测试 2、可能是集群总线端口未开放 若通讯端口为6379，那么集群总线端口16379一定要打开 3、clust ......
AT_abc326_e Revenge of "The Salary of AtCoder Inc." 题解
AT_abc326_e Revenge of "The Salary of AtCoder Inc." 题解 一道简单的概率论+动态规划题目（然而我赛时没看这道题 题意 有一个长度为 \(n\) 的序列 \(A\)、一个 \(n\) 面骰子，掷若干次骰子，如果这一次掷骰子的点数小于等于上一次的点数， ......
报错:The server time zone value ‘�й���ʱ��’ is unrecognized or represents more than one time zone
在运行项目的时候遇到了这样一个报错，是数据库的问题但是不知道是什么原因，在网上搜了一下发现只需要在url后面加上serverTimezone=UTC这串代码就行了 例如 jdbc:mysql://localhost:3306/result?characterEncoding=UTF-8&server ......
在CentOS7上更改端口号时报错：Job for sshd.service failed because the control process exited with error
1、问题描述 在在CentOS7×上更改端口号时报错: “Job for sshd.service failed because the control process exited with error code.See ‘systemcl status& sshd service" and fo ......
How to Find the Size of a DB2 Database
How to Find the Size of a DB2 Database EMBER CROOKS JUNE 19, 2012 15 COMMENTS How big is it? How much space do we need if we copy it? How big will it ......
Unveiling the Dangers of Land Pollution
Unveiling the Dangers of Land Pollution Land, the very foundation of life, sustains ecosystems, supports agriculture, and provides spaces for human ha ......
Water Pollution: The defination, types, causes, effects and meatures.
What is water pollution? Water pollution can be defined in many ways. Usually, it means one or more substances have built up in water to such an exten ......
3 ways light pollution harms the planet - and what we can do about it
Light pollution not only impacts the environment, but our health too. ·Global light pollution has increased by 49% over 25 years to 2017, new research ......
「CF715E」Complete the Permutations
\(\text{「CF715E」Complete the Permutations}\) \(\text{Link}\) \(\text{Describe}\) 给定长为 \(n\) 的且部分确定的置换 \(p,q\)。定义 \(p,q\) 距离为通过交换 \(p\) 任意两项变为 \(q\) 的最 ......
#期望dp#CF1810G The Maximum Prefix
洛谷题面 CF1810G 分析 考虑最大前缀和满足两个条件，就是所有前缀和都不超过，以及一定有一个等于。 那么就要保证它能达到最大值且一直不能高于它 设 \(dp[i][j][0/1]\) 表示前 \(i\) 个数离达到最大值还需要 \(j\) 且未/已经达到过最大值。 初始化就是 \(dp[0][ ......
Cannot connect to the Docker
执行docker基础命令失败！ Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? 原因：docker服务没有启动。 解决方法：执行 systemctl s ......
B. The Walkway
大意： B. The Walkway 在一个二维公园中,有n个椅子，从一个一直到另一个椅子的时间为d,有m个卖饼干,分布在$s_i$椅子旁边, 当且仅当以下条件中至少有一个成立时，他才会在$ i$长凳附近吃饼干： 在第 $i$个长凳附近有一个卖饼干的人。那么 Petya 就会从卖饼干的人那里买一块饼 ......
[LeetCode] 2558. Take Gifts From the Richest Pile
You are given an integer array gifts denoting the number of gifts in various piles. Every second, you do the following: Choose the pile with the maxim ......
macos pip3 安装 mycli/scrapy 路径报错 WARNING: The script tabulate is installed in '/Users/modys/Library/Python/3.9/bin' which is not on PATH.
WARNING: The script tabulate is installed in '/Users/modys/Library/Python/3.9/bin' which is not on PATH. python没有添加到环境变量 export PATH=/Users/<you>/Libr ......
Why do I hear a NoiseHiss in the IEM system
# Why do I hear a Noise/Hiss in the IEM system? ``` Why do I hear a Noise/Hiss in the IEM system? The most common hiss that is referred to is caused b ......
docker: Error response from daemon: Conflict. The container name "/web" is already in use by container ......
问题：docker启动docker容器时报错docker: Error response from daemon: Conflict. The container name is already in use by container You have to remove (or rename) t ......
EF出现错误：An error occurred while updating the entries. See the inner exception for details.
问题：EF出现错误An error occurred while updating the entries. See the inner exception for details 场景：适用Excel批量导入数据时，提示了以上错误 解决思路： 1、查看是否有重复的主键 2、是否有不可为空的字段没有 ......
Paper Reading: WCDForest: a weighted cascade deep forest model toward the classifcation tasks
针对 gcForest 存在的一些缺点，本文提出了一种 WCDForest 模型来提高小样本分类数据集的准确率。为了提高 WCDForest 的特征提取能力，提出了一种等量多粒度扫描模块，可以平等地扫描边缘特征。提出了类向量加权模块和特征增强模块，它们重新评估了 RF 在多粒度扫描和级联森林阶段的分... ......
PAT 甲级【1012 The Best Rank】
本题用java极容易超时，提交了好几次才成功 另外90 88 77 77 50，名次应该是1 2 3 3 5 ，不是1 2 3 3 4 import java.io.*; public class Main { @SuppressWarnings("unchecked") public static ......
The 2021 ICPC Asia Macau Regional Contest
\(C. Laser Trap\) 根据题意不难判断出需要极角排序，然后对于每个点寻找更小的一个 \(180\) 度的点数。即使听说是用双指针实现查找依旧没什么思路。后来看了别人的实现方法发现确实比较简单，甚至只需要维护极角就可以了。 const long double pi=acosl(-1); ......
The Dance After Last Dance - CSP2023 游记
波神留我看斜阳，唤起层层细浪。 高三也不过是这样，在银杏叶黄的烂漫的季节，骑车回家的路上总能望见绯红的轻云，但银杏叶下也缺不了成群结队的“高考”的速成班，手里拿着致密的复习资料，桌上凌乱的堆着书本和卷子，形成一座富士山。也有摒弃一切杂念，专心学习，于外界断绝一切联系的，宛如未出闺阁的小姑娘一般，还要 ......
Data truncation: Invalid JSON text in argument 1 to function json_extract: "The document is empty." at position 0.问题解决
问题描述： json格式不规范导致的，仅使用where+json_valid清洗似乎并不足以解决问题 解决方法： select order_number,sku_code,CASE WHEN JSON_VALID(sales_price) THEN sales_price ELSE null END ......
kernel function: the difference beween cdev_add and device_create
To use a character driver, first you should register it with the system. Then you should expose it to the user space. 1. cdev_init and cdev_add functi ......
[ERROR KubeletVersion]: the kubelet version is higher than the control plane version.
kubeadm、kubelet、kubectl 一起安装时，由于疏忽写成kubelet-1.27.3.0，结果版本变成kubelet-1.28了，导致报标题中的错误 安装指定版本 yum -y install kubeadm-1.27.3-0 kubelet-1.27.3-0 kubectl-1.2 ......
eslint提示 xxx should be listed in the project's dependencies
有时候手动安装了一个npm包A，npm包A里面包含了npm包B，这时候如果 import xxx from 'npm包B'; eslint会报错，提示 npm包B 不在 package.json 里面 解决方法：在 eslintrc.js 增加配置 module.exports = { rules: ......
Disconnected from the target VM, address: '127.0.0.1:56577', transport: 'socket' 端口占用
Disconnected from the target VM, address: '127.0.0.1:56577', transport: 'socket' 端口占用 Disconnected from the target VM, address: '127.0.0.1:56577', tra ......
CF1132C Painting the Fence 题解
@目录DescriptionSolutionCode Description 有一面长为 \(n\) 的墙以及 \(q\) 个工人，第 \(i\) 个工人粉刷 \(l_i\) 到 \(r_i\) 的墙面，现在要去掉两个工人，问剩余 \(q-2\) 个工人最多能粉刷多少墙面。 Solution 注意数 ......
pgsql create table,cpp fill psql table via the third party library pqxx
//create table t1; create table t1(id bigserial not null primary key,author varchar(40) not null,comment varchar(40) not null,content varchar(40) not ......
CF809D Hitchhiking in the Baltic States-平衡树+DP
CF809D Hitchhiking in the Baltic States-平衡树+DP Statement 给出 \(n\) 个区间 \([l_i,r_i]\) 和 \(n\) 个未知数 \(a_1,a_2,\dots,a_n\)，现在你要确定这 \(n\) 个数，使得 \(a_i\in[l_ ......
The ConnectionString property has not been initialized.
原因： 情况1 DbContext中没有指定连接字符串 解决： 情况2 appsettings.json 配置文件的属性没有设置为始终复制 ......