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The 2023 ICPC Nanjing Regional Contest G,F
G. 背包 我们要是选一个集合出来 并且免除k个宝石的话 我们一定是选最贵的k个宝石免费 这样我们的做法就是对wi排序 然后前面的做背包 后面直接贪心选vi最大的k个 这样是一定包含了最优解的 当然你可以用二分bit 也可以直接维护另一个dp int n,tr1[200010],tr2[200010 ......
The solution of soil erosion
Solution of soil erosion (1) Engineering measures: building terraces, damming and silting land, using earthwork and concrete works, fish scale pits, e ......
Oracle执行块中的异常处理
PL/SQL异常处理是PL/SQL块中对执行部分出现异常进行处理的部分。PL/SQL采用的是统一异常处理机制，当异常发生时，程序会自动跳转到异常处理部分，交给异常处理程序进行异常匹配，再调用对应的处理方法。如果程序出现异常，而没有找到对应的异常处理程序，则程序会直接中断抛出异常。PL/SQL异常可以 ......
cf1325D. Ehab the Xorcist（位运算trick）
https://codeforces.com/contest/1325/problem/D 有一个非常经典的结论 a+b=(a^b)+2(a&b) 这个题就可以往上面靠，首先我们观察一下，对于两个数的情况，如果(v-u) mod 2=1,必然无解，试着将它扩展一下，也是对的，因为最低一位没有进位。 ......
Kattis - A Complex Problem (The 2023 ICPC Rocky Mountain Regional Contest)
Intro This was one of the problems I didn't do during the regional contest. One of my teammates solved it. Observation There are few things to note. F ......
The governance measures of marine oil pollution
The governance measures (1). Preventive measures. Prevention is one of the most effective control methods, including the following aspects: a. Strengt ......
Grafana监控Oracle数据库的表大小等信息
Grafana监控Oracle数据库的表大小等信息 方案 oracledb_exporter 以及 prometheus grafana 使用的SQL以及配置文件 [[metric]] context = "table_sizeinfo" labels = [ "table_nameinfo","t ......
kubeadm部署的k8s证书过期问题 k8s问题排查：the existing bootstrap client certificate in /etc/kubernetes/kubelet.conf is expired
解决问题： 估计跟移动有关，下面那个没解决问题，是因为在原有文件的基础上修改的吧？而这里直接是移走，重新生成了新的。不太清楚是不是这个原因。 $ cd /etc/kubernetes/pki/ $ mv {apiserver.crt,apiserver-etcd-client.key,apiserv ......
The PRC's Policy of Tackling Water Pollution
THE POLICY CONTEXT The industrial water management system in the PRC is spread over two phases (see Figure 1). The first phase is "before-process", wh ......
the use of photovoltaic to prevent and control desertification
Land desertification is one of the main causes of sandstorm disaster. With the further intensification of global warming, desertification is becoming ......
Get environmentally friendly, biodegradable plastics into the market
Now digital techs empower plastic pollution combat in China, and our new material combined with non-enzymic hydrolysis, water dissolution and biodegra ......
The 10th Jimei University Programming Contest
外校打星队伍，排名22/450，还算凑合吧。 A. A+B问题 直接枚举进制 #include <bits/stdc++.h> using namespace std; using vi = vector<int>; void solve() { string str; vi a, b, s; ci ......
The methods for Global Warming
The methods for deal with Global Warming: China's emission reduction measures to address climate change: mainly through market means, supplemented by ......
How does China solve the water pollution?
How does China solve the water pollution? One River, One Plan and One Map With the continuous development of China's economy and society, sudden water ......
The use of green energy can effectively solve the problem of air pollution
The use of green energy can effectively solve the problem of air pollution 一、the operation of green energy Green energy refers to a way of producing a ......
simple-check-100
代码脚本解开法 #include <stdio.h> int main(int argc, char* argv[]) { char flag_data[] = { 220, 23, 191, 91, 212, 10, 210, 27, 125, 218, 167, 149, 181, 50, 16 ......
windows服务器中Oracle数据库定时备份
脚本准备 rem delete 10 days files forfiles /p "文件路径" /d -10 /c "cmd /c echo deleting @file ... && del /f @path" rem expdp sz set sz_file=备份文件名字%date:~0,4% ......
oracle异常
1、SQLSyntaxErrorException: ORA-00947: 没有足够的值 大概率是关系表实际列数大于你所填的元素个数，请检查是否有疏漏的列即可 2、MyBatis操作Oracle批量插入 ORA-00933: SQL 命令未正确结束 1) 在Oracle中表名的别名不能使用as，直接 ......
Oracle ODP.NET ConnectionString接池及连接参数
出自： https://blog.csdn.net/qq_28570965/article/details/126935639 1. 连接字符串中提供了服务器地址，端口，实例等信息，具体格式如下：Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOS ......
EF报错：Unable to create an object of type 'XXXXXXX'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728
这个是在EF迁移的时候报错： 解决方案：修改你的MyDbcontext： 代码如下： public class StoreDbContexttFactory : IDesignTimeDbContextFactory< ‘你的类名’> { public ‘你的类名’CreateDbContext(s ......
Oracle集群RAC DG日常检查指令
目录操作系统进程检查Pmon检查负载检查数据库检查查看数据库打开状态和相关信息查找主库判断集群正常与否判断会话等待查看连接数 并与数据库配置对比判断集群和DG状态RACDG 操作系统进程检查 Pmon检查 pmon（Process Monitor process）用于监控其他后台进程。负责在连接出现 ......
The Measures of Ocean Trash
Ocean Trash Solutions: 7 Things You Can Do Today Everyone can do something to help solve the plastic pollution problem, and millions of people worldwi ......
Oracle找出所有表字段中值包含中文并生成扩充字段的SQL脚本
Oracle找出所有表字段中值包含中文并生成扩充字段的SQL脚本 背景 后续计划将Oracle的某个库迁移到云上的达梦库，Oracle字符集为ZHS16GBK，达梦库字符集为UTF-8。 我们知道，中文汉字在UTF8中一个汉字占3个字节，而在GBK中则是占2个字节，测试过程发现若字段中存有中文的行， ......
Oracle工具类
Oracle工具类 public abstract class DbHelperOra { //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库. public static string connectionString = PubConst ......
Improving The Fetch XML Performance using Latematerialize -如何使用Latematerialize提高Fetch XML 查询性能
假设要从包含 100,000 条记录、100 多列的表中提取 500 个，根据过滤条件，需要几分钟才能获取记录。 原因是应用程序传统上 fetchxml 首先获取所有 100,000 条记录和数百列。然后它根据查询执行过滤器以获取记录。 为了克服这一挑战，如果我们一个查询，首先提取所需 500 条记 ......
Introducing the core concepts of Kafka
Introduction I have learnt the kafka since 5 years, I believe I learnd somthing, It is on time for improving english. So I decided to pick up my blogs ......
The 2021 ICPC Asia Macau Regional Contest
https://codeforces.com/gym/104373 A. So I’ll Max Out My Constructive Algorithm Skills 随便选一条路径，若不合法则 reverse 即可。 E. Pass the Ball! 大小相等的置换环显然可以合并，大小不同的 ......
The art of shellcode
目录1-如何编写shellcode1-1 纯手搓1-1-1 纯汇编1-1-2 内联汇编1-1-3 使用tiny_libc1-2 借助工具1-2-1 pwntools的shellcraft1-2-2 alpha31-2-3 AE641-2-4 shellcode encoder1-2-5 msf生成1 ......
Codeforces Round 428 (Div. 2) B. Game of the Rows
题目链接 题面翻译 现在有 \(K\) 个队，飞机有 \(N\) 排座位，每排能坐 \(8\) 个人，不同队伍的人不能坐相邻的位置。 相邻情况有 \(5\) 种 \((1, 2), (3, 4), (4, 5), (5, 6), (7, 8)\)。请问这 \(n\) 排座位是否够坐。 （\(K\) ......