monocarp and set the
CF1770F Koxia and Sequence
#### 题意 给定非负整数 $n,x,y$，对于所有满足 $\sum\limits_{i=1}^{n}a_i=x$ 并且 $\text{OR}_{i=1}^{n}a_i=y$ 的 $\{a_n\}$，求 $\bigoplus\limits_{i=1}^{n}a_i$ 的异或和。 $n\le 2^{ ......
CF1361E James and the Chase
#### Description 给定一个有 $n$ 个点 $m$ 条边的**有向强连通图**。称一个点是**好的**当且仅当它到其他点都有且只有一条**简单路径**。如果好的点至少有 $20\%$ 则输出所有好的点，否则输出 `-1`。 $\sum n\leq 10^5,\sum m\leq 2\ ......
Your project does not reference ".NETFramework,Version=xxx" framework. Add a reference to ".NETFramework,..." property of your project file and then re-run NuGet restore.
错误：Your project does not reference ".NETFramework,Version=v4.6.1" framework. Add a reference to ".NETFramework,Version=v4.6.1" in the "TargetFramework ......
CF1152F2 Neko Rules the Catniverse (Large Version) 题解
发现挨位考虑填哪个不太现实，考虑值域。 令 $dp_{i,j,st}$ 表示考虑到 $i$，此时序列长度为 $j$，$i-m$ 到 $i-1$ 填空状态为 $st$ 的方案数，考虑选/不选数即可： $dp_{i,j,st}\times (\text{popcount}(st)+1)\to dp_{i ......
arcgis注册postgresql失败。postgres be sure the databse client software is installed and configured correct
解决： 将PostgreSQL\9.1\bin目录下的Libpq.dll,Libeay32.dll, Libintl-8.dll, Ssleay32.dll复制一份放在ArcGIS Server安装目录的Server\bin***意：这里拷贝的文件需要都是64位的。 重启arcgis server服 ......
NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.
###问题提示： ` NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and runn ......
【863】Calculate records based on the same value
Suppose we have a dataframe, it has a column of "country". It lists different names of country's names, and for one country maybe it has multiple reco ......
set
set 显示或设置shell特性及shell变量 ## 补充说明 **set命令** 作用主要是显示系统中已经存在的shell变量，以及设置shell变量的新变量值。使用set更改shell特性时，符号"+"和"-"的作用分别是打开和关闭指定的模式。set命令不能够定义新的shell变量。如果要定义 ......
Codeforces 1621H - Trains and Airplanes
这能 3500？ 对于一组在 $u$ 上的询问，考虑每种线路 $x$，假设 $1\to u$ 路径上线路 $x$ 的长度为 $len$，那么不难发现收罚款的次数只有两种可能：$\lfloor\dfrac{len}{T}\rfloor$ 或者 $\lfloor\dfrac{len}{T}\rfloor ......
Perkins Engines: Reliable Power in Harsh Environments and High-Strength Operations
Perkins Engines: Reliable Power in Harsh Environments and High-Strength OperationsHello everyone! Today I would like to share with you a powerful engi ......
发布-订阅（Publish-and-Subscribe）模型
发布-订阅（Publish-and-Subscribe）模型是一种消息传递模式，用于在软件系统中实现异步通信和解耦。它基于发布者（发布消息的实体）和订阅者（接收和处理消息的实体）之间的解耦原则。 在发布-订阅模型中，发布者和订阅者之间不直接交互，而是通过一个称为消息代理或消息中间件的组件来进行通信。 ......
CF1842G Tenzing and Random Operations 思考
借鉴了一下 namelessgugugu 的想法，妙妙题。 [link](https://www.luogu.com.cn/blog/namelessgugugu/solution-cf1842g) 这个神奇工具的构造确实挺妙的，非常好的思维题，在此记录一下 ### 代码 ```cpp #inclu ......
cpp generate uuid via rand() and test speed which is 4 times+ faster than libuuid
// main.cpp #include <algorithm> #include <chrono> #include <cstdio> #include <cstdlib> #include <cstdint> #include <ctime> #include <fstream> #includ ......
Linux系统Apache报错httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain. Set the 'ServerName' directive globally to suppress this message
解决办法： 在配置文件中加一句ServerName localhost:端口号 # echo "ServerName localhost:8068" >> /etc/httpd/conf/httpd.conf 重启Apache即可解决。 ......
HTTP/2 stream 1 was not closed cleanly before end of the underlying stream解决
通过git clone 文件时报错 HTTP/2 stream 1 was not closed cleanly before end of the underlying stream 解决： git config --global http.versioin HTTP/1.1 重新git clon ......
Codeforces 1172F - Nauuo and Bug
是 Ynoi 捏。 建一棵线段树，线段树上每个节点维护一个长度为 $len$ 的 DP 数组 $f_i$ 表示 $v$ 最少需要多少才能使得从左往右将 $v$ 与区间中的数进行图中的相加操作后会减掉至少 $i$ 次 $p$。 如果我们能预处理出 $f_i$，那么查询是容易的，直接找到对应的区间然后 ......
升级EF7连接SQL server出错SqlException: A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 - 证书链是由不受信任的颁发机构颁发的。)
今天把项目里的Microsoft.EntityFrameworkCore.SqlServer和Microsoft.EntityFrameworkCore.Tools从6.0.6升级到了最新的7.0.9。一运行程序出错了。 ![img](https://img2023.cnblogs.com/blog ......
Linux系统Apache添加监听端口后无法启动服务并报错：Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xeu httpd.service" for details.
导言：这是SE Linux安全机制导致的。 解决方法： 1.查看当前httpd端口 # semanage port -l|grep http 2.将对应端口加入SE Linux，以8068为例 # semanage port -a -t http_port_t -p tcp 8068 3.再次查看 ......
linux SSH client and terminal termius
介绍一款SSH终端神器，termius 优美的界面，高效的性能，免费版本足够我们使用。支持 mac , windows 双平台！ 官网：https://www.termius.com/ 下载地址：https://termius.com/download/ 主界面： ![image](https:// ......
[AGC045D] Lamps and Buttons 题解
# [AGC045D] Lamps and Buttons 题解 首先，由于排列生成随机，所以最优决策就是不决策（反正你也不知道），也就是，让 Snuke 从左往右依次按。 那么，什么情况下 Snuke 会输呢？我们可以把每个 $p_i$ 向 $i$ 连边，我们发现，如果灭着的灯里面存在自环，也就是 ......
LOADING Redis is loading the dataset in memory
MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. P ......
[LeetCode] 2597. The Number of Beautiful Subsets
You are given an array nums of positive integers and a positive integer k. A subset of nums is beautiful if it does not contain two integers with an a ......
MIT 6.S081 Multiprocessors and locking
why lock 防止多核并行运行下的 race condition 导致的错误。 内核中的数据是典型的 concurrently-accessed 的数据。 race condition and how the lock avoid it A race condition is a situati ......
《DeepChain: Auditable and Privacy-Preserving Deep Learning with Blockchain-based Incentive》论文笔记
本文的研究背景： 在各种机器学习任务中，深度学习可以实现比传统机器学习算法更高的精度。最近，保护隐私的深度学习引起了信息安全界的极大关注，其中训练数据和训练模型都不会被暴露。联合学习是一种流行的学习机制，其中多方将局部梯度上传到服务器，服务器使用收集的梯度更新模型参数。然而，在联合学习中存在许多被忽 ......
MIT6.s081/6.828 lectrue1：Introduction and examples
目前课程官网能够查到 2020,2021.2022 秋季的课程表，但是视频都是 2020 年录制的那一版 简单复习+回顾下自己的 OS 学习之旅 ## 参考资料： 官网：https://pdos.csail.mit.edu/6.828/2022/schedule.html 视频翻译：https:// ......
invalidate the cache in Spark by running 'REFRESH TABLE tableName' command in SQL or by recreating the Dataset/DataFrame involved
``` ... 1 more Caused by: java.io.FileNotFoundException: File does not exist: hdfs://ns1/user/hive/warehouse/dw.db/dw_uniswapv3_position_detail/pk_day ......
The file extension is not supported by Shapefile data provider.
后端返回：文件上传失败：The file extension is not supported by Shapefile data provider. 表明此时上传/处理的文件不符合标准。 ......
These are the list of external providers available to the application.
These are the list of external providers available to the application. https://github.com/davidfowl/TodoApi/blob/c209f6ae5c5f31f4808b0df85f358d4a572ea ......
Troubles in RunBase's Pack and Unpack Methods
### Trouble description: > When user processed the batch job after clearing the usage data, dialog's parameters will catch the current data from proce ......