monocarp and set the
JavaSEday05 泛型,数据结构,List,Set集合
javSE day05 泛型,数据结构,List,Set 今日目标 泛型使用 数据结构 List Set 1 泛型 1.1 泛型的介绍 泛型是一种类型参数，专门用来保存类型用的 最早接触泛型是在ArrayList，这个E就是所谓的泛型了。使用ArrayList时，只要给E指定某一个类型，里面所有用到 ......
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 ......
CF1304E 1-Trees and Queries（lca+树上前缀和+奇偶性）
题目 二话不说，直接按题意模拟暴搜，当然 \(O(nq)\) 的复杂度显然是寄了的。 不过，在模拟的过程中，我在链式前向星的删边中居然一开始错了，还是要 mark 一下以后注意。 void del(int x, int pre) { e[top].to = e[top].next = 0; h[x] ......
Maven打包项目时异常：Cannot access nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public) in offline mode and
package是报错 Cannot access nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public) in offline mode and the artifact org.apache.maven.surefire ......
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 ......
C++ insert into tables of pgsql via libpq-fe.h and compile by g++-13
1.Install libpq-dev sudo apt install libpq-dev locate libpq-fe.h /usr/include/postgresql/libpq-fe.h 2.create table t1 create table t1(id bigserial not ......
Getting Started with MongoDB and C++
This article will show you how to utilize Microsoft Visual Studio to compile and install the MongoDB C and C++ drivers on Windows, and use these drive ......
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 ......
C. Serval and Toxel's Arrays 组合数学
题目链接🔗 分析一下题意：给定一个初始数组A，以及m次操作，每一次操作会改变一个A中的数字，一共得到m+1个数组。 现在，要求出任意两个数组两两组合的情况中：所有的不重复数字出现次数的总和。 这道题想了很久，乍一看以为是模拟，手画递归找规律一直没想出来。看了题解思路，发现出发点就错了：因为每个数组 ......
CF1485E Move and Swap 题解
不要什么脑子的带 \(log\) 做法。 思路 考虑 \(dp_{i,j}\) 表示红点到 \(i\)，蓝点到 \(j\) 的最大权值。 那么有： \[dp_{i,j}=\max(dp_{fa_i,pre},dp_{fa_j,pre})+|a_i-a_j| \]其中 \(pre\) 是任意一个上一层 ......
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 ......
【动态规划】【动态 DP】 CF750E New Year and Old Subsequence
题目描述 定义数字串是好的当且仅当其包含子序列 2017 ，不包含子序列 2016。 定义数字串的丑陋值为最少删掉几个字符，它才能是好的，如果一直不能，就是 \(-1\) 。 给定数字串 \(t\) ，长度为 \(n\) ，\(q\) 次询问求 \([l,r]\) 的丑陋值。 \(1 \leq n, ......
Mysql中between...and引起的索引失效问题及解决【转】
发生场景 在查询学生表的时候，需要支持根据创建时间来筛选出某段时间内入学的学生总数，因此在创建时间上加了索引，但是最终发现还是会走全量查询。 实验过程 1 2 3 4 5 6 7 CREATE TABLE `t_user` ( `id` bigint(11) unsigned NOT NULL CO ......
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 ......
TALLRec: An Effective and Efficient Tuning Framework to Align Large Language Model with Recommendation
目录概TallRec代码 Bao K., Zhang J., Zhang Y., Wang W., Feng F. and He X. TALLRec: An effective and efficient tuning framework to align large language model ......
【转】GN Language and Operation
原文链接：https://gn.googlesource.com/gn/+/refs/heads/main/docs/language.md 这里还有一篇：谷歌gn编译文件的使用简介 GN Language and Operation Contents GN Language and Operati ......
mysql 查询报错Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column
这个错误是由于 MySQL 的新版本中默认开启了ONLY_FULL_GROUP_BY模式，即在 GROUP BY 语句中的 SELECT 列表中，只能包含分组或聚合函数，不能包含其他列。而你的查询语句中出现了一个列senior_two.score.student_id，它既没有被分组也没有被聚合，因 ......
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 ......
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 ......
.Net6 and VsCode CodeFirst开发和迁移使用
VsCode开发.net6 干货如下： C# Base language support for C# 包含vscode的调试 C# Dev Kit C# Extensions IntelliCode IntelliCode API Usage Examples IntelliCode Comple ......