[social4i size="small" align="align-left"][This article was first published onSteve's Data Tips and Tricks, and kindly contributed toR-bloggers]. (You can report issue about the content on this pagehere)Want to share your content on R-bloggers?click hereif you have a blog, orhereif you don't.IntroductionLoops are a fundamental concept in programming that allow you to execute a block of code repeatedly until a specified condition is met. In C, two commonly used loop constructs are thewhileloop and thedo whileloop. As a beginner C programmer, understanding how to effectively use these loop ...继续阅读 (13)

Back to basic!Quick SortclassSolution{private:voidrecursive(std::vector&nums;,intleft,intright){if(left>=right){return;}intmid=left+(right-left)/2;intval=nums[mid];std::swap(nums[mid],nums[right]);intlow=left;inthigh=right-1;while(low<=high){if(nums[low]>val){std::swap(nums[low],nums[high--]);}else{++low;}}std::swap(nums[low],nums[right]);recursive(nums,left,low-1);recursive(nums,low+1,right);}public:voidquickSort(std::vector&nums;){recursive(nums,0,nums.size()-1);}};Binary Searchsize_tlowerBound(conststd::vector&nums;,inttarget){size_tleft=0;size_tright=nums.size();while(left= the targetif(nu ...继续阅读 (14)

本文介绍了仓颉语言中的 while 表达式，详细讲解了其基本语法和用法。通过实例演示了如何使用 while 循环计算阶乘、在循环中使用布尔标志控制流程，以及使用 break 提前终止循环和 continue 跳过当前迭代。代码示例丰富且包含详细注释，帮助读者更好地理解循环结构在实际编程中的应用。此外，扩展了原有代码逻辑，增强了仓颉语言的实际使用场景。 ...继续阅读 (37)

本文详细介绍了仓颉语言中的 do-while 循环结构及其使用方法，涵盖了基本语法、数字输出、阶乘计算等常见应用场景。通过实例代码演示了如何使用 break 提前终止循环，以及 continue 跳过当前循环的技巧。此外，本文还扩展了代码示例，帮助读者更好地掌握循环控制的高级用法，并提供了详细的中文注释，便于理解。 ...继续阅读 (20)

本文深入介绍了 Go 语言中的数值数据类型，包括有符号与无符号整数、浮点数和复数，帮助开发者理解不同数据类型的特性与使用场景。此外，还详解了 Go 中 for 循环的灵活应用，包括传统的迭代循环、while 和 do...while 循环的模拟，展示了 range 关键字在遍历数组和切片中的强大功能。通过丰富的代码示例，本文帮助读者更好地掌握 Go 语言中数值处理和循环控制的核心技巧。 ...继续阅读 (44)

不少朋友在安装 VS Code 插件时遇到了这个报错 Error while fetching extensions.XHR failed，今天就分享一下这个错误的解决方案，希望对大家有帮助… ...继续阅读 (48)

之前写过如何在服务器重启的时候感知长连接，最近发现折腾复杂了。https://github.com/encode/starlette/discussions/1776测试代码：import asyncio async def async_streamer(): try: while True: yield b"--boundary\r\nContent-Type: text/plain\r\nContent-Length: 1\r\n\r\n1\r\n" await asyncio.sleep(0) except asyncio.CancelledError: print("caught cancelled error") app = Starlette(routes=[ Route('/async', async_endpoint), ])跑起来：uvicorn stream:app这段代码粗一看没啥大不了的，但是神奇的地方在于，如果去掉try ... except asyncio.CancelledError，代码也能正常跑async def async_streamer(): while True: yield b"--boundary\r\nC ...继续阅读 (104)

文章 链接到标题 技术 链接到标题 Keeping the lights on while leaving the cloud But programmers are attracted to complexity like moths to a flame. The more convoluted the systems diagram, the greater the intellectual masturbation. Our commitment to resisting that is the key ingredient in this uptime success. You don’t need the cloud to get good uptimes. You need mature technologies run on redundant hardware with good backups. Same as it ever was. ...继续阅读 (102)

The thin aluminium sheet providers in China like Huawei Aluminum dedicated in aluminum processing for greater than two decades. Alloy skinny aluminium sheet are extra not unusual in our every day lifestyles, so what problems should we be aware of whilst shopping for?1, while buyingthin aluminum sheet, ensure that there are no defects within the welding method. Its technique approach is easy, many small thin aluminium sheet providers can produce it, with excessive excellent and good workmanship. In case you choose a poor aluminum sheet, it may be difficult because of rough processing, choppy sp ...继续阅读 (74)

As autumn's crisp breeze sets in and the leaves begin to changegym shirt, fitness enthusiasts everywhere are gearing up for their fall workouts. While staying active is essential year-round, the transition to cooler weather calls for a wardrobe update. Gym sweatshirts for women have become a staple in autumn fitness attire, blending style and functionality seamlessly. In this article, we'll explore the top trends in gym sweatshirts for women to help you look and feel your best during your autumn workouts.The classic hoodie is a timeless favorite that never goes out of style. For autumn workout ...继续阅读 (83)

Question1Anugly numberis a positive integer whose prime factors are limited to2,3, and5.Given an integern, returntrueifnis anugly number**.Algorithm1Easy implementation, check if the number can be divided by 2 or 3 or 5, otherwise it's not an ugly number.Code1classSolution{publicbooleanisUgly(intn) {if(n<=0)returnfalse;while(n%2==0) {n/=2;}while(n%3==0) {n/=3;}while(n%5==0) {n/=5;}returnn==1;}}Question2Anugly numberis a positive integer whose prime factors are limited to2,3, and5.Given an integern, returnthenthugly number.Algorithm2This question is to generate the ugly number. Start from num1, ...继续阅读 (8)

QuestionGiven an arraynumsofnintegers, returnan array of all theuniquequadruplets[nums[a], nums[b], nums[c], nums[d]]such that:0 <= a, b, c, d < na,b,c, anddaredistinct.nums[a] + nums[b] + nums[c] + nums[d] == targetYou may return the answer inany order.AlgorithmA follow up of 3 sum.From 3 sum what you can learn? Reduce to 2 sum. So for 4 sum we many want to reduce to 3 sum and then to 2 sum.So here is a recursive process and the base condition is k == 2.When k is bigger than 2, we go through all the unvisited numbers and make it a member, and recursive make the target (target - this number), ...继续阅读 (16)

QuestionGiven a non-negative integerx, returnthe square root ofxrounded down to the nearest integer. The returned integer should benon-negativeas well.Youmust not useany built-in exponent function or operator.For example, do not usepow(x, 0.5)in c++ orx ** 0.5in python.Example 1:Input: x = 4 Output: 2 Explanation: The square root of 4 is 2, so we return 2.Example 2:Input: x = 8 Output: 2 Explanation: The square root of 8 is 2.82842..., and since we round it down to the nearest integer, 2 is returned.AlgorithmA easiest way to solve it is to utilize math. How you solve it in math just implement ...继续阅读 (14)

总结了一些实用的文本处理的函数。 搜索 1.根据正则 REGEXP 搜索文本 STRING，返回匹配的数量 (defun tps-search-count (string regexp) (let ((start 0) (count 0)) (save-match-data (while (string-match regexp string start) (cl-incf count) (setq start (match-end 0)))) count)) (tps-search-count "Treat a man as ...继续阅读 (22)

联系：手机/微信(+86 17813235971) QQ(107644445)标题：ORA-10485: Real-Time Query cannot be enabled while applying migration redo.作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]对于数据库打psu和jvm patch之后,dg备库同步会出现类似ORA-10485: Real-Time Query cannot be enabled while applying migration redo.异常Tue Aug 15 18:48:18 2023 ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION Attempt to start background Managed Standby Recovery process (orcl) Tue Aug 15 18:48:18 2023 MRP0 started with pid=33, OS id=15486 MRP0: Background Managed Standby Recovery process started (orcl) started ...继续阅读 (121)

联系：手机/微信(+86 17813235971) QQ(107644445)标题：ORA-10485: Real-Time Query cannot be enabled while applying migration redo.作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]对于数据库打psu和jvm patch之后,dg备库同步会出现类似ORA-10485: Real-Time Query cannot be enabled while applying migration redo.异常Tue Aug 15 18:48:18 2023 ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION Attempt to start background Managed Standby Recovery process (orcl) Tue Aug 15 18:48:18 2023 MRP0 started with pid=33, OS id=15486 MRP0: Background Managed Standby Recovery process started (orcl) started ...继续阅读 (101)

// 单链表节点的结构publicclassListNode{intval;ListNodenext;ListNode(intx){val=x;}}链表链表是以节点的方式来存储,是链式存储每个节点包含data 域，next域:指向下一个节点.链表分带头节点的链表和没有头节点的链表，根据实际的需求来确定.基础知识哈希表的简单介绍哈希表在使用层面上可以理解为一种集合结构如果只有key，没有伴随数据value，可以使用HashSet结构(C++中叫UnOrderedSet)如果既有key，又有伴随数据value，可以使用HashMap结构(C++中叫UnOrderedMap)有无伴随数据，是HashMap和HashSet唯一的区别，底层的实际结构是一回事使用哈希表增(put)、删(remove)、改(put)和查(get)的操作，可以认为时间复杂度为O(1)，但是常数时间比较大放入哈希表的东西，如果是基础类型，内部按值传递，内存占用就是这个东西的大小放入哈希表的东西，如果不是基础类型，内部按引用传递，内存占用是这个东西内存地 址的大小在java中 HashSet就是一个只使用HashMap的key的一个集合。有序表的简单介绍有序表在使用层面上可以理解为一种集合结构如果只有key，没有伴随数据value，可以使用TreeSet结构(C++中叫OrderedSet)如果既有key，又有伴随数 ...继续阅读 (109)

该问题发生在提交Apache Hudi DeltaStreamer作业时，DeltaStreamer作业会读取Kafka中的CDC消息，并落地为一张Hudi表，这是DeltaStreamer的主要功能。从字面意义上分析，这个错误的原因是DeltaStreamer在连接Kafka时超时，故而无法读取topic，在排除了网络因素之后（一条用有的经验：在AWS上，排除网络防火墙因素的快速方法是将所在VPC的安全组短暂设为全开（仅供参考，须自行评估风险），测试通过就是网络问题了，后面精心配置一下安全组即可），问题锁 ...继续阅读 (109)

QuestionGiven an array of integersnumssorted in non-decreasing order, find the starting and ending position of a giventargetvalue.Iftargetis not found in the array, return[-1, -1].You must write an algorithm withO(log n)runtime complexity.AlgorithmFor this problem, I firstly came up a trivial binary search, when we encounter the target, we use a while loop to find the left and right side, however this is O(n) in worst case.The standard solution is to use two separate binary search. Actually I came up this idea at first to keep the O(Log(n)) time, but I tried to put the left and right side hand ...继续阅读 (9)

JS的For循环方式主要有： 1. for 循环 2. for ... in 循环 3. for ... of 循环 4. forEach() 除了 for循环外， JavaScript 还具有其他循环方式，例如 while、do...while、map() 方法等 ...继续阅读 (108)

QuestionGiven anm x nmatrix, returnall elements of thematrixin spiral order.Example:Input: matrix = [[1,2,3,4],[5,6,7,8],[9,10,11,12]] Output: [1,2,3,4,8,12,11,10,9,5,6,7]Constraints:m == matrix.lengthn == matrix[i].length1 <= m, n <= 10-100 <= matrix[i][j] <= 100AlgorithmNo trick question, implement step by step according to intuition.CodeclassSolution{publicListspiralOrder(int[][]matrix) {Listres=newArrayList();if(matrix==null||matrix.length==0||matrix[0]==null||matrix[0].length==0) {returnres;}intbottom=matrix.length-1;intright=matrix[0].length-1;intleft=0;inttop=0;introw=left;intcol=top;wh ...继续阅读 (15)

QuestionGiven an encoded string, return its decoded string.The encoding rule is:k[encoded_string], where theencoded_stringinside the square brackets is being repeated exactlyktimes. Note thatkis guaranteed to be a positive integer.You may assume that the input string is always valid; there are no extra white spaces, square brackets are well-formed, etc. Furthermore, you may assume that the original data does not contain any digits and that digits are only for those repeat numbers,k. For example, there will not be input like3aor2[4].The test cases are generated so that the length of the output ...继续阅读 (12)

QuestionGiven a stringpath, which is anabsolute path(starting with a slash'/') to a file or directory in a Unix-style file system, convert it to the simplifiedcanonical path.In a Unix-style file system, a period'.'refers to the current directory, a double period'..'refers to the directory up a level, and any multiple consecutive slashes (i.e.'//') are treated as a single slash'/'. For this problem, any other format of periods such as'...'are treated as file/directory names.Thecanonical pathshould have the following format:The path starts with a single slash'/'.Any two directories are separated ...继续阅读 (13)

QuestionGiven a list a number, find its next permutation.AlgorithmFirst method come to my mind is using backtracking to find all the permutation in order and find the one after the given array. Which require O(n!) time and O(n) space.While we are required to find the next onein place.So we watch the decision tree, try to find the pattern behind it.To be honest, I didn't come up with it completely before I turned to the standard answer. (The thing I missed is I swapa[i]anda[i-1])The next permutation is you go through the array and find the first pair of number wherea[i] > a[i -1], and then you ...继续阅读 (10)

在线演示 立刻下载 While Harington is especially designed for use by designers, artists, photographers, and a...阅读更多 ...继续阅读 (4)

[social4i size="small" align="align-left"][This article was first published onOpen Analytics, and kindly contributed toR-bloggers]. (You can report issue about the content on this pagehere)Want to share your content on R-bloggers?click hereif you have a blog, orhereif you don't.The source of every data science project is a dataset or even multiple. In general, scientists prefer to share data using a spreadsheet. This allows to quickly explore, enter and modify data. Software developers on the other hand, prefer to build around properly designed schemes and backends that ensure data integrity. ...继续阅读 (19)

New York is three hours ahead of California,But that doesn’t make California slow.Someone graduated at the age of 22,But waited five years before securing a good job.Some became a CEO at 25,And died at 50.While another became a CEO at 50,And lived to 90 years.Someone is still single,While someone else got married.Obama retired at 55,& Trump started at 70.Everyone in this world works based on their time zone.People around you might seem to be ahead of you,& some might seem to be behind you.But everyone is running their own race, in their own time.Do not envy them & do not mock them.They are in ...继续阅读 (58)

在某些编程语言中，例如 C/C++、C#、PHP、Java、JavaScript 等等，do-while 是一种基本的循环结构。它的核心语义是：先执行一遍循环体代码，然后执行一遍条件语句，若条件语句判断为真，则继续执行循环体代码，并再次执行条件语句；直到条件语句判断为假，则跳出循环结构。流程图如下（Java 示例）：// 打印小于 20 的数字publicclassTest{publicstaticvoidmain(String[]args){intx=10;do{System.out.print("value of x : "+x);x++;System.out.print("\n");}while(x<20);}}Python 并不支持 do-while 结构，“do”并不是一个有效的关键字。那么，为什么 Python 不提供这种语法结构呢，这种现状的背后有何种设计考量因素呢？在回答这个问题之前，让我们再仔细思考一下 do-while 语法可以解决什么问题，看看使用这种结构能带来什么好处？最显而易见的好处是：do-while 语法保证了会先执行一遍循环体代码。它的使用场景也许不多，但是，跟普通的 while 循环或者 for 循环语法的“条件前置”思想不同，它体现的是一种“条件后置”的编程逻辑，也是一种控制循环的常见方式。它们的关系似乎有点像 C/C++ 这些语言中的i++与+ ...继续阅读 (62)

React Query使用stale-while-revalidate缓存机制，并且存在后台刷新数据的机制。因此状态检查就变的非常重要。本文主要说明后台刷新数据时，会带来的一些问题和解决方法。More… ...继续阅读 (60)

CF Gym :Dashboard - The 2020 ICPC Asia Shenyang Regional Programming Contest - CodeforcesDJourney to Un’Goro123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475#includestdc++.h>/#includeextc++.h>/#define int long long//__int128#define mmst0(x) memset(x,0,sizeof(x))#define mmst3f(x) memset(x,0x3f,sizeof(x))#define pb(x) emplace_back(x)#define mkp(x, y) make_pair(x, y)#define fi first#define se secondusingnamespacestd;//using namespace __gnu_pbds; //If using pbds don't using std!typedeflonglongll;typed ...继续阅读 (15)