问题描述 博览馆正在展出由世上最佳的 M 位画家所画的图画. wangjy 想到博览馆去看这几位大师的作品. 可是,那里的博览馆有一个很奇怪的规定,就是在购买门票时必须说明两个数字, a 和 b ,代表他要看展览中的第 a 幅至第 b 幅画 ( 包含 a 和 b) 之间的所有图画,而门票的价钱就是一张图画一元. 为了看到更多名师的画, wangjy 希望入场后可以看到所有名师的图画 ( 至少各一张 ) . 可是他又想节省金钱... 作为 wangjy 的朋友,他请你写一个程序决定他购买门票时的 …

1. 引言     在红黑树--算法导论(15)中学习了红黑树的原理.本来打算自己来试着实现一下,然而在看了JDK(1.8.0)TreeMap的源码后恍然发现原来它就是利用红黑树实现的(很惭愧学了Java这么久,也写过一些小项目,也使用过TreeMap无数次,但到现在才明白它的实现原理).因此本着"不要重复造轮子"的思想,就用这篇博客来记录分析TreeMap源码的过程,也顺便瞅一瞅HashMap. 2. 继承结构 (1) 继承结构 下面是HashMap与TreeMap的继承结构: pu…

What is a memory model, anyway? In multiprocessorsystems, processors generally have one or more layers of memory cache, whichimproves performance both by speeding access to data (because the data iscloser to the processor) and reducing traffic on the…

Spring中 @Transactional 注解的限制1. 同一个类中, 一个nan-transactional的方法去调用transactional的方法, 事务会失效 If you use (default) Spring Proxy AOP, then all AOP functionality provided by Spring (like @Transational) will only be taken into account if the call goes through…

开启阅读模式 WATERHAMMER A COMPLEX PHENOMENON WITH A SIMPLE SOLUTION Waterhammer is an impact load that is the most misunderstood force known to pressure transducers today. A waterhammer is created by stopping and/or starting a liquid flow suddenly. The re…

QUESTION 13 View the Exhibit.Examine the following command that is executed for the TRANSPORT table in the SH schema:SQL> SELECT DBMS_STATS.CREATE_EXTENDED_STATS('sh', 'customers_obe', '(country_id,cust_state_province)') FROM dual;Which statement des…

1. Java Classloader 链接: https://en.wikipedia.org/wiki/Java_Classloader 摘要: The Java Classloader is a part of the JRE that dynamically loads Java classes into the JVM. Usually only loaded on demand. In Java, libraries are typically packaged in JAR fil…

1Z0-053 争议题目解析681 考试科目:1Z0-053 题库版本:V13.02 题库中原题为: 681.The environmental variable ORACLE-BASE is set. You want to check the diagnostic files created as part of the Automatic Diagnostic Repository (ADR). View the Exhibit and note the various parameter…

1Z0-053 争议题目解析694 考试科目:1Z0-053 题库版本:V13.02 题库中原题为: 694.As part of archiving the historical data, you want to transfer data from one database to another database, which is on another server. All tablespaces in the source database are read/write and on…

1Z0-053 争议题目解析702 考试科目:1Z0-053 题库版本:V13.02 题库中原题为: 702.View the Exhibit and examine the parameter settings in your server-side parameter file (SPFILE). When you tried to start the database instance, you received the following error: Why did the insta…

1Z0-053 争议题目解析703 考试科目:1Z0-053 题库版本:V13.02 题库中原题为: 703.Given below are RMAN commands to enable backup optimization and set the retention policy: The USERS tablespace has never been backed up. You take the USERS tablespace offline on Monday. View the…

1Z0-053 争议题目解析704 考试科目:1Z0-053 题库版本:V13.02 题库中原题为: 704.View the Exhibit and examine the data manipulation language (DML) operations that you performed on the NEWEMP table. Note that the first two updated are not listed by the Flashback Versions Query…

Consolidate multiple tasks or operations into a single computational unit. This pattern can increase compute resource utilization, and reduce the costs and management overhead associated with performing compute processing in cloud-hosted applications…

2. View the Exhibit to examine the description for the SALES table. Which views can have all DML operations performed on it? (Choose all that apply.) create table sales( prod_id number not null, cust_id number not null, time_id date not null, channel…

Chapter_3 Intensity Transsformations and Spatial Filtering 灰度变换与空间滤波 Intensity transformation function s = T(r) (size of the neighborhood is 1*1) Some Basic Intensity Transformation Functions 1.Image Negatives 图像反转 $ s = T(r) = L - 1 - r $ 2.Log Tran…

转自:http://blog.evjang.com/2017/01/nips2016.html           Eric Jang Technology, A.I., Careers               Monday, January 2, 2017 Summary of NIPS 2016   The 30th annual Neural Information Processing Systems (NIPS) conference took place in Barcelona…

1:介绍 java虚拟机支持多线程运行.线程代表的就是Thread class.对用户来说创建线程的唯一办法就是创建一个Thread对象:每一个线程都和一个Thread对象关联.Thread对象调用start()方法就启动了相应的线程. 线程的表现,尤其是当不能正常同步的时候,会变得混乱和违法直觉.这个规范说明(指:jsr133)描述了java语言里多线程编写的语义定义:它包含了这样的规则:即定义共享内存的读线程能够读到被共享内存的写线程写入的哪些数据.尽管这个规范类似于不同硬件架构的内存模型,…

我理解PCA应该分为2个过程:1.求出降维矩阵:2.利用得到的降维矩阵,对数据/特征做降维. 这里分成了两篇博客,来做总结. http://matlabdatamining.blogspot.com/2010/02/principal-components-analysis.html 英文Principal Components Analysis的博客,这种思路挺好,但是有2处写错了,下面有标注. http://www.cnblogs.com/denny402/p/4020831.html 这个…

通过pickle来序列化: # -*- coding: utf-8 -*- import pickle #-------------------序列化--------------------- zoo_animals_1 = { 'Unicorn' : 'Cotton Candy House', 'Sloth' : 'Rainforest Exhibit', 'Bengal Tiger' : 'Jungle House', 'Atlantic Puffin' : 'Arctic Exhibit'…

The author has a course on web: http://brickisland.net/DDGSpring2016/ It has more reading assignments and sliders which are good for you to understand ddg. ------------------------------------------------------------- DISCRETE DIFFERENTIAL GEOMETRY :…

Java基础常见英语词汇(共70个) ['ɔbdʒekt] ['ɔ:rientid]导向的                             ['prəʊɡræmɪŋ]编程 OO: object-oriented ,面向对象 OOP: object-oriented programming,面向对象编程 [dɪ'veləpmənt][kɪt]工具箱                              ['vɜːtjʊəl]虚拟的 JDK:Java development kit, j…

It’s been awesome seeing the level of interest developers have had for the Async CTP and how much usage it’s getting.  Of course, with any new technology there are bound to be some hiccups.  One issue I’ve seen arise now multiple times is developers…

原 apps被拒绝的各种理由以及翻译 1. Terms and conditions(法律与条款) 2. Functionality(功能) 3. Metadata (name, descriptions, ratings, rankings, etc)(描述数据(名称,描述,评级,分类等)) 4.location(位置) 5. Push notifications(提醒推送) 6. Game Center(游戏中心) 7. Advertising(广告) 8. Trademarks and t…

为了加深对缓存算法的理解,特转此篇,又由于本文内容过多,故不做翻译,原文地址Working Set页面置换算法 In the purest form of paging, processes are started up with none of their pages in memory. As soon as the CPU tries to fetch the first instruction, it gets a page fault, causing the operating sy…

在部署Word/Excel到服务器的时候,经常会碰到权限问题.例如;   Retrieving the COM class factory for component with CLSID {00024500-0000-0000-C000-000000000046} failed due to the following error: 8000401a 因为配置类型不正确,系统无法开始服务器进程.请检查用户名和密码. (Exception from HRESULT: 0x8000401A).  …

3832: [Poi2014]Rally Time Limit: 20 Sec  Memory Limit: 128 MBSec  Special JudgeSubmit: 168  Solved: 84[Submit][Status][Discuss] Description An annual bicycle rally will soon begin in Byteburg. The bikers of Byteburg are natural long distance cyclists…

递归知识:oop,xpath,jsp,items,pipline等专业网络知识,初级水平并不是很scrapy,可以从简单模块自己写. 初窥Scrapy Scrapy是一个为了爬取网站数据,提取结构性数据而编写的应用框架. 可以应用在包括数据挖掘,信息处理或存储历史数据等一系列的程序中. 其最初是为了 页面抓取 (更确切来说, 网络抓取 )所设计的, 也可以应用在获取API所返回的数据(例如 Amazon Associates Web Services ) 或者通用的网络爬虫. 本文档将通过介绍S…

A - Guess Your Way Out! Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 507C Description Amr bought a new video game "Guess Your Way Out!". The goal of the game is to find an ex…

FROM ME : 文章介绍了6个Promise的知识点: 1.then() 返回一个 forked Promise(分叉的 Promise):返回的有两种情况: 2.回调函数应该传递结果:在 promise 的上下文中,回调函数像普通的回调函数一样传递结果,返回的结果传给下一个回调函数: 3.只能捕获来自上一级的异常 4.错误能被恢复:在一个错误回调中,如果没有重新抛出错误,promise 会认为你已经恢复了该错误,promise 的状态会转变为 resolved. 5.Promise 能被暂…

题目描述 Farmer John's N cows (1 ≤ N ≤ 100,000) share many similarities. In fact, FJ has been able to narrow down the list of features shared by his cows to a list of only K different features (1 ≤ K ≤ 30). For example, cows exhibiting feature #1 might h…