advanced feedback problems control
Action plan for soil pollution control.
Action plan for soil pollution control In May 2016, The State Council issued the "Soil Pollution Prevention and Control Action Plan" (referred to as t ......
Action plan for soil pollution control
Action plan for soil pollution control How does it work? First, to carry out soil pollution investigation and grasp the status of soil environmental q ......
Control measures of land pollution
Soil is a necessary condition for human survival and reproduction, and soil environmental quality is related to people's livelihood and well-being, ec ......
Plastic Pollution Control Action Plan
What is the Plastic Pollution Control Action Plan? Since China issued the Opinions on Enhanced Control Measures against Plastic Pollution in January 2 ......
pojo层、dao层、service层、controller层的作用
分层解耦介绍 1.pojo层（model） 实体层 数据库在项目中的类 model是模型的意思，与entity、domain、pojo类似，是存放实体的类。 类中定义了多个类属性，并与数据库表的字段保持一致，一张表对应一个model类。 主要用于定义与数据库对象应的属性，提供get/set方法,to ......
How To Solve The Problem Of Air Pollution
How To Solve The Problem Of Air PollutionThe report "China's Carbon Neutrality and Clean Air Synergy Pathway (2023)" was published in Beijing on Novem ......
“Job for network.service failed because the control process exite”问题
[root@node3 ~]# service network restart Restarting network (via systemctl): Job for network.service failed because the control process exited with err ......
Current Outdoor Lighting Policies in China: Measures to Control Light Pollution
AbstractLight pollution is a serious environmental issue with many adverse effects on human health and the ecosystem as a whole. Accordingly, many cou ......
Measures of Controlling Desertification
As land desertification continues to worsen, our country has taken some measures to control it. 1.Tree planting and afforestation. 2.Wind resistance a ......
PSO Solve N-Queen Problem
title: PSO Solve N-Queen Problem layout: page categories: data analysis PSO Solve 16-Queen Problem The N-Queens problem is a classic problem in the fi ......
CF1325E Ehab's REAL Number Theory Problem
题目传送门 题目大意 给定 \(n\) 个数，每个数的因数个数不超过 \(7\)，求最少选出多少个数能使得乘积为一个完全平方数。 无解输出 \(-1\)。 思路 约数个数定理：对于 \[n=\prod^{k}_{i=1}p_i^{a_i} \]\(n\) 的正约数个数为 \(\prod^{k}\li ......
nginx ingress controller EWMA负载均衡策略工作原理及修改过程
1、概念 EWMA（Exponentially Weighted Moving Average）策略是 NGINX Ingress Controller 中的一种负载均衡算法，它用于决定请求应该由后端服务的哪个实例处理。 2、工作原理 EWMA 策略通过指数加权移动平均的方式计算每个后端服务实例的权 ......
SEERC 2020 Problem H
题目链接 模拟赛搬了这题，场切了顺手写个题解。 这种题当然先考虑单组询问怎么做，然后再拓展出去。 设按位与的集合是 \(A\)，按位或的集合是 \(B\)，结果都是 \(x\)，我们考虑 \(A,B\) 的元素应该满足的性质。不难发现，所有 \(y<x\) 的 \(y\) 都应该在 \(B\)，\( ......
[ABC327G] Many Good Tuple Problems 题解
题意 对于一对长度均为 \(M\) 且元素值在 \(\left[1, N\right]\) 之间的序列 \((S, T)\)，定义其为好的当且仅当： 存在一个长度为 \(N\) 的 \(01\) 序列 \(X\)，使得其满足如下条件： 对于任意 \(i \in \left[1, M\right]\) ......
NEFU OJ Problem1356 帽儿山奇怪的棋盘 题解
帽儿山奇怪的棋盘 题目： Time Limit:1000ms Memory Limit:65535K Description 军哥来到了帽儿山，发现有两位神人在顶上对弈。棋盘长成下图的模样： 每个点都有一个编号：由上到下，由左到右，依次编号为 1、2……12。两位神人轮流博 弈，每一轮操作的一方可以 ......
environmental problem--deforestation
Deforestation is a serious environmental issue in China and many other countries. The main reasons for deforestation are economic development needs, u ......
Trailhead - 证书维护挑战失败 提示Whoops, looks like there was a problem. Please try again.
前情提要 当进行Trailhead证书维护的时候，往往会需要完成答题+挑战（Challenge）。然而有时候会遇到下述的问题👉代码正确（至少看起来）并且在页面验证通过，在Challenge里Check时却提示”Whoops, looks like there was a problem. Plea ......
China's Air Pollution Problem
China's Air Pollution Problem Air pollution is a global problem, but China is particularly serious about it. In recent years, China's air quality inde ......
Solution to OpenSSL Connection Problems With Github
Problems Uploading Files with Git Sometimes we can use git tool to successfully upload projects to Github, but in other time especially after a period ......
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 ......
https://www.luogu.com.cn/problem/P1104 生日问题笔记
标记：当出现一组数据中有多个数据，这个时候我们常考虑用结构体去编写代码，因为结构体可以使得 几个本不相关的变量联系起来，并且当一个变量改变时，其他变量也会跟着改变，这使得代码变得简单。 使用结构体后，我们在读入数据之后，我们用sort 进行排序，并且构造一个cmp函数，使得我们的排序 满足题目的要求 ......
Urbanization Problem in CHINA
Urbanization Rapid urbanization has taken place in China ever since the economic development and socioeconomic changes of the 1980s. Approximately 40% ......
springMVC controller控制器方法HttpServletRequest等参数的是谁传递进来的
SpringMVC中两个重要的接口：请求方法参数的处理、响应返回值的处理，分别是HandlerMethodArgumentResolver和HandlerMethodReturnValueHandler HandlerMethodArgumentResolver 的实现类 ServletReques ......
2021 CCPC桂林 B.A Plus B Problem (线段树)
传送门 线段树大模拟!。考验线段树功底的时候来了，作为队伍的史山选手，写这么史也是情有可原的。 #include <bits/stdc++.h> using ll = long long; const int INF = 0x3f3f3f3f; const int N = 1e6 + 10; typ ......
CF1073G Yet Another LCP Problem
一道 *2600 调了一年，代码细节是有点粪了，但自己菜也是挺菜的。/oh/oh 考虑容斥，令 \(f(A)=\sum\limits_{i,j\in A}\operatorname{lcp}(i,j)\)，那么答案就是 \(f(A\cup B)-f(A)-f(B)\)（这里的并表示可重集合并）。 令 ......
MongoDB flow control
从 MongoDB 4.2 开始，管理员可以限制主节点的写入速度，目的是将多数提交的延迟保持在可配置的最大值 flowControlTargetLagSeconds 以下。 默认情况下， flow control 是启用的。 启用 flow control 后，当延迟时间接近 flowControl ......
Controller 中的请求方法，private 和 public有什么区别？别用错了！
作者：hinotoyk 链接：https://juejin.cn/post/6910215219822362632 背景：某日在公司中撸代码的时候，在一个常用的controller中添加一个方法，测试时突然报错说注入的service为null，捣鼓一阵发现后是方法修饰符写成private，修改成pu ......
SSL certificate problem: unable to get local issuer certificate 错误解决
终端报了如下错误git SSL certificate problem: unable to get local issuer certificate 这个问题是由于没有配置信任的服务器HTTPS验证。默认，cURL被设为不信任任何CAs，就是说，它不信任任何服务器验证。在网上查了很多方法，最终使用 ......
[HDU 3483] A Very Simple Problem 题解
题目描述 快速求出下面式子的值： \[\left(\sum\limits_{k=1}^{N}k^{x}x^{k}\right)\bmod M \]其中 \(1 ≤ N, M ≤ 2\times 10^9\), 并且 \(1 ≤ x ≤ 50\)。 题解 (solution) 对于该类题目，\(N\) ......
windows下的mysql安装connection_control
环境:OS:Windows 2012mysql:5.7.29 1.root账号登录mysqlmysql>mysql -h localhost -uroot -pmysql -P13306mysql>install plugin connection_control soname 'connectio ......