concepts complex number basic
Oracle 分组排序函数详解 (row_number、rank、dense_rank)
1 概述 项目开发中,我们有时会碰到需要分组排序来解决问题的情况:1)要求取出按field1分组后,并在每组中按照field2排序;2)亦或更加要求取出1中已经分组排序好的前多少行的数据。 1. 完整格式 (1) row_number() over(partition by col1 order b ......
vue2 el-input-number 千分位显示的支持(不影响v-model的数值取值)
<!-- 增加v-thousands指令 --> <el-input-number v-model="row.money" v-thousands :controls="false" :min="0" :precision="2" style="width: 100%" // 添加全局指令或局部指令 ......
[ABC234E] Arithmetic Number 题解
题目传送门 一道枚举题。 暴力枚举数字位数、首位、等差数列的公差即可。注意公差的枚举范围,并且需要看看末尾合不合法。顺便提一下,我是用字符串存储枚举的数字的,所以写了一个 check 函数代替大于号。 Code #include <bits/stdc++.h> using namespace std ......
[LeetCode] 1356. Sort Integers by The Number of 1 Bits 根据数字二进制下1 的数目排序
You are given an integer array arr. Sort the integers in the array in ascending order by the number of 1's in their binary representation and in case ......
ErrorReply: ERR wrong number of arguments node redis 连接问题解决
今天在测试kvrocks 与socket.io 集成的时候出现了此问题,刚好记录下 原始连接配置 const pubClient = createClient({ url:"redis://dalongdemo@localhost:6666/0"}); 问题修改 const pubClient = ......
Greedy algorithm basic principle
贪心算法是以动态规划方法为基础的,在每个贪心算法之下,几乎总有一个更繁琐的动态规划算法。 贪心算法和动态规划不同之处在于:是否需要考虑子问题的解 贪心算法并不考虑子问题,直接在当前步骤中做出选择 动态规划无论是自底向上, 贪心算法设计步骤 将最优化问题转化为这样的形式:对其做出一次选择后,只剩下一个 ......
Dynamic programming basic principle
There is a confusing question, i.e. the name of this method is dynamic programming, how can we understand it ? The dynamic programming in chinese is " ......
CF367C Sereja and the Arrangement of Numbers
这题首先上来会发现题目中的很多信息都是假的,核心就是问要构造一个\(x\)个点的完全图至少要多长的序列 我们把序列中相邻的两个元素看作图上的一条边,则可以把问题转化为:给一个\(x\)个点的完全图,问至少要走多长的路径才可以遍历图中的所有边至少一次 简单讨论下会发现当\(x\)为奇数时,此时图中每个 ......
PAT_A 1038 Recover the Smallest Number
Given a collection of number segments, you are supposed to recover the smallest number from them. For example, given { 32, 321, 3214, 0229, 87 }, we c ......
[913] Updating a Table of Contents (TOC) in a Word document using pywin32 to display numbers
If the python-docx method mentioned earlier doesn't work on your computer, you can try using the pywin32 library, which allows you to interact with Mi ......
Secure Code Warrior C# Basic OWASP Web Top 10 2017 8: Insecure deserialization, 9: Using Components with Known Vulnerabilities, 10: Insufficient Logging and Monitoring
Last but not least. These set challenges consist of 8: Insecure deserialization, 9: Using Components with Known Vulnerabilities, 10: Insufficient Logg ......
Secure Code Warrior C# Basic OWASP Web Top 10 2017 5: Broken Access Control, 6: Security Misconfiguration and 7: XSS vulnerabilities
Learn the ropes or hone your skills in secure programming here. These challenges will give you an understanding of 5: Broken Access Control, 6: Securi ......
Secure Code Warrior C# Basic OWASP Web Top 10 2017 1: Injection Flaws and 2: Broken Authentication vulnerabilities 3: Sensitive Data Exposure and 4: XXE vulnerabilities
Let's continue with some other very common application weaknesses. This set of levels will focus on 3: Sensitive Data Exposure and 4: XXE vulnerabilit ......
Secure Code Warrior C# Basic OWASP Web Top 10 2017 1: Injection Flaws and 2: Broken Authentication vulnerabilities
Let's start with the most critical application weaknesses. These challenges get you the foundations of 1: Injection Flaws and 2: Broken Authentication ......
[906] Replace NaN (Not-a-Number) values with 'Null' in Pandas
In Pandas, you can replace NaN (Not-a-Number) values in a DataFrame with None (Python's None type) or np.nan (NumPy's NaN) values. Here's how you can ......
CF585F Digits of Number Pi
CF585F Digits of Number Pi 更好的阅读体验 观察数据范围,考虑数位 DP。 首先把长串中 \(len\geq\lfloor \frac{d}{2}\rfloor\) 的串提出来,塞进一个 trie 里,然后建立 ACAM,然后直接 DP 就行了。 设 \(f_{i,j,0/ ......
How can I change the reference numbers in manuscript to blue color?
How can I change the reference numbers in manuscript to blue color? I am working in Word 2010 and EndNote X7. I want to change the color of citations ......
PythonNotes_Basic1
基本数据类型 标准数据类型 常见数据类型: Number(数字) String(字符串) bool(布尔类型) List(列表) Tuple(元组) Set(集合) Dictionary(字典) 六个标准数据类型中: 不可变数据(3 个):Number(数字)、String(字符串)、Tuple(元 ......
PythonNotes_Basic
Python3 基础 目录 1 基本数据类型 2 数据类型转换 3 算术运算符 4 条件控制 5 条件控制 6 条件控制 ......
Educational Codeforces Round 96 (Rated for Div. 2) A. Number of Apartments
有三种建筑:三室厅、五室厅、七室厅。每个房间严格有一扇窗户。现在有 \(n\) 扇窗户,询问完全用完这些窗户的情况下,\(3, 5, 7\) 室厅各有多少间。输出任意一种答案,或者回答不可能。 假设一定有解,显然可以选择 \(mod\) 任意一个数贪心,不妨选最小的 \(3\) 。假设答案为 \(a ......
Codeforces Round 690 (Div. 3) C. Unique Number
给一个正整数 \(x\) ,需要构造一个最小的正整数 \(n\) 使得 \(\sum digt(n) = x\) ,并且 \(\forall i \neq j, digt(n)_i \neq digt(n)_j\) 。 首先观察到 \(0\) 没有贡献,且会增加位数,所以不能有 \(0\) 。 由于 ......
Codeforces Round 697 (Div. 3) B. New Year's Number
给出一个数 \(n\) ,询问能否存在 \(2020x + 2021y = n\) 。 对于方程 \(ax + by = n\) 可以直接解 \(exgcd\) 查询是否有解。 观察到 \(2020x + 2021y = n\) 可以化为 \(2020(x + y) + y = n\) 。不妨定为 ......
Concepts in ML
生成模型和判别模型 https://blog.csdn.net/weixin_39910711/article/details/89483662 Encoder-Decoder架构 https://blog.51cto.com/u_15588078/6531178?u_atoken=2514a604 ......
struct.error: 'H' format requires 0 <= number <= 65535
全部代码如下: from pymodbus.client import ModbusTcpClient # 避坑:write_registers和write_register函数差一个s。多一个s的参数用整型列表,没有的只能用整型 def split_float_to_integer_and_fra ......
C# RestSharp 添加 Basic Auth 验证
var client = new RestClient("http://example.com"); var Username="123"; var Password="123"; client.Authenticator = new HttpBasicAuthenticator(Username, ......
[LeetCode] 2282. Number of People That Can Be Seen in a Grid_Medium tag: stack.
You are given an m x n 0-indexed 2D array of positive integers heights where heights[i][j] is the height of the person standing at position (i, j). A ......
[LeetCode] 1944. Number of Visible People in a Queue_Hard tag: stack
There are n people standing in a queue, and they numbered from 0 to n - 1 in left to right order. You are given an array heights of distinct integers ......
[CF1870F] Lazy Numbers
Lazy Numbers 我觉得本题难度在于银剑的构造...... 我们把 k 进制下的数去掉前导零放在 Trie 树上,并且越高位的深度越小,这样我们看出某个节点的 dfs 序就是排名,称排名减数值为 va。我们需要求 va=0 的点数。 不难发现某一深度从左往右的 va 单调不降,所以可以二分求 ......
Basic concepts of complex number
目录虚数的引入复数和虚数的关系Example - 分辨一个数判断两个复数是否相等的条件共轭复数复数的几何意义、复平面的认识求复数的模 虚数的引入 假设有一个数,可以叫它狗逼数,但是不太好听,改成高大上一点,叫成虚数吧! 对它的定义如下: 虚数=i \(i^2\) = -1 这样搞有什么好处吗? 假设 ......
[CF878E]Numbers on the blackboard
E - Numbers on the blackboard 最后的答案肯定为\(\sum_{l\leq i\leq r} 2^{p_i}\times a_i\) 然后这个\(p\)满足以下限制: \(p_i=0\)(\(i=l\)) \(1\leq p_i\leq p_{i-1}+1\)(\(l<i ......