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埃拉托斯特尼筛法（sieve of Eratosthenes ） 是古希腊数学家埃拉托斯特尼发明的计算素数的方法。对于求解不大于 n 的所有素数，我们先找出 sqrt(n) 内的 所有素数p1到pk ，其中 k = sqrt(n) ，依次剔除 Pi 的倍数，剩下的所有数都是素数。 具体操作如上述 图片所示。 C++实现 #include<iostream> #include<vector> using namespace std; int main() { int n; cin >> n; vector<bool> isprime(n + 5, true); vector<int> ans; for (int i = 2; i <= n; i++) { if (isprime[i]) { ans.push_back(i); for (int j = i * i; j <= n; j += i)isprime[j] = false; } } for (auto i : ans)cout << i << " "; cout << endl; return 0; } 整除问题 给定n，a求最大的k，使n！可以被a k整除但不能被a (k+1)整除。 输入描述 两个整数n(2<=n<=1000)，a(2<=a<=1000) 输出描述 示例1 输入 555 12 输出 274

https://www.ted.com/talks/katie_bouman_what_does_a_black_hole_look_like/transcript 00:13 In the movie " Interstellar [ˌɪntərˈstelə(r)] 星际的 ," we get an up-close look at a supermassive black hole. Set against a backdrop of bright gas, the black hole's massive gravitational [ˌgrævɪˈteɪʃənl] 万有引力的 pull bends light into a ring. However, this isn't a real photograph, but a computer graphic rendering -- an artistic interpretation of what a black hole might look like. 00:32 A hundred years ago, Albert Einstein first published his theory of general relativity. In the years since then, scientists have

The OData service url being tested is: /sap/opu/odata/sap/CRM_ODATA/TaskCollection?$filter=isMyTask eq true&$expand=DocumentNotes,DocumentNextUserStatuses,DocumentHistories,DocumentApplicationLogs,Attachments Approach1 – gateway client Log on your gateway ( frontend ) server, use tcode /IWFND/GW_CLIENT, paste the url and execute. Then you will get execution time in unit Millisecond. Approach2 – Chrome development tool Open Chrome development tool via F12, paste the COMPLETE url with host name and port number and execute. The time will be displayed in column “Time”. Hover the mouse to column

We can define bean configuration in xml and then can get instantiated bean instance with help of all kinds of containers for example ClassPathXmlApplicationContext as displayed below: The content of Beans.xml: <?xml version="1.0" encoding="UTF-8"?> <!-- http://stackoverflow.com/questions/18802982/no-declaration-can-be-found-for-element-contextannotation-config --> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema

Before we start to research tail recursion, let’s first have a look at the normal recursion. A simple factorial implementation by recursion: function factorial(n){ if(n ===1) { return 1; } return n *factorial(n -1); } Let N = 5, see how new stack frame is created for each time of recursive call: We have two stack frames now, one stores the context when n = 5, and the topmost one for current calculation: n = 4 Now since n equals to 1, we stop recursion. The current stack frame ( n = 1 ) will be poped up, the frame under it will be activated and become the topmost frame, with calculated result 1

https://hackernoon.com/a-super-quick-comparison-between-kafka-and-message-queues-e69742d855a8 A super quick comparison between Kafka and Message Queues Hendrik Swanepoel Follow Jun 10, 2017 This article’s aim is to give you a very quick overview of how Kafka relates to queues, and why you would consider using it instead. Kafka is a piece of technology originally developed by the folks at Linkedin. In a nutshell, it’s sort of like a message queueing system with a few twists that enable it to support pub/sub, scaling out over many servers, and replaying of messages. These are all concerns when

准备工作 1、配置好手机的环境（一般是googlePay商城和googlePay服务，必须注册一个账号登录） 2、VPN 3、申请一个googlePay的开发者账号把一些基础信息填好，配好商品D（注：商品ID只能用一次，一但注册好删除后，就无法再次注册商品ID） 4、上传一个包体获得publicKey（代码里面需要） 代码工作 1、准备好androidStudio 2、从他官网的样品中找到aidl这个文件夹存放至Main里面 3、在AndroidManifest中添加权限 < uses-permission android:name ="com.android.vending.BILLING" /> 4、初始化googlePay 　　　　　　String base64EncodedPublicKey ="xxxxxx" ; mHelper = new IabHelper( this , base64EncodedPublicKey); mHelper.enableDebugLogging( true ); mHelper.startSetup( new IabHelper.OnIabSetupFinishedListener() { public void onIabSetupFinished(IabResult result) { Log.d(TAG, "Setup

英雄联盟：英雄台词翻译（我用双手成就你的梦想。） 一、总结 一句话总结： 李青：Your will,my hands. Your will my hands 1、 一点寒芒先到，然后枪出如龙！ ？ 德邦： Here is a tip，and a spear behind it. Here_is a_tip and a_spear behind_it 2、 何以与君识，无言泪千行。 ？ 亚索：With tears,and silence. With tears and silence 3、 天空是无用且垂死的星辰。 ？ -狗头：the sky is useless and dying stars. the_sky is useless_and_dying stars 4、 断剑重铸之日，骑士归来之时！ ？ 锐雯：What is broken can be refoeged! What_is_broken can_be_refoeged 5、 生与死，轮回不止。我们生，他们死。 ？ 狗头：The cycle of life and death continues,we will live,they will die. The_cycle_of life_and_death continues we_will_live they_will_die 6、 风之化身听候您的差遣。 ？ 迦娜

首页 / Data Ingestion & Streaming / Why Ambari is setting the security protocol of the kafka to PLAINTEXTSASL instead of SASL_PLAINTEXT? 个问题 ，截止 Param NC 2017年02月26日 08:36 kerberos Kafka Hi All , During Kerboraizing the kafka using the Ambari , it is setting the kafka security protocol to PLAINTEXTSASL instead of SASL_PLAINTEXT, but everywhere in the document is it mentioned that it must be SASL_PLAINTEXT , I have few questions regarding this . 1. Why Ambari setting the security protocol to PLAINTEXTSASL , is it a bug ? 2. Even though we are able to produce and consume the messages from program

一、Django ORM中models的字段和参数 一、Django ORM中models的字段 　　1、所有的字段类型 AutoField(Field) - int自增列，必须填入参数 primary_key= True BigAutoField(AutoField) - bigint自增列，必须填入参数 primary_key= True 注：当model中如果没有自增列，则自动会创建一个列名为id的列 from django.db import models class UserInfo(models.Model): # 自动创建一个列名为id的且为自增的整数列 username = models.CharField(max_length=32 ) class Group(models.Model): # 自定义自增列 nid = models.AutoField(primary_key= True) name = models.CharField(max_length=32 ) SmallIntegerField(IntegerField): - 小整数 -32768 ～ 32767 PositiveSmallIntegerField(PositiveIntegerRelDbTypeMixin, IntegerField) - 正小整数 0 ～ 32767