puts "Let's practice everything." puts 'You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.' # the <<END is a "heredoc". See the Student Questions. poem = <<END \tThe lovely world with logic so firml…

本文是一篇笔记,大部分内容取自 CLRS 第三版,第 24.1 节. Exercise 24.1-4 Modify the Bellman-Ford algorithm so that it sets $v.d$ to $-\infty$ for all vertices $v$ for which there is a negative-weight cycle on some path from the source to $v$. Theorem 24.4 (Correctness of…

I believe that the following Python code is really not hard to understand. But I think we should use these tips in our own code. def main(): #To judge whether a list is empty. We can use "if list0" instead of "if len(list0)". But we mu…

Unit 4 Youth Issues: Computer Use 1 Model1题目及范文分析 Some teenagers spend a lot of time playing computer games and this can cause both social and health problems for them, What are some of the problems caused by playing computer games? Model 1 Playing c…

Dev401-012:Proseving Data Quality Universal Containers Scenario1.Universal Containers(UC) wants to enforce standards for managing positions and candidates company-wide.2.UC would like the Recruiting app to help guide its hiring managers to always fil…

mathworks社区中的这个资料还是值得一说的. 1 openExample('mpc/mpccustomqp') 我们从几个角度来解析两者关系,简单的说就是MPC是带了约束的LQR. 在陈虹模型预测控制一书中P20中,提到在目标函数中求得极值的过过程中,相当于对输出量以及状态量相当于加的软约束 而模型预测控制与LQR中其中不同的一点,就是MPC中可以加入硬约束进行对状态量以及输出量的硬性约束 形如:S.T.表示的硬性约束,在LQR中没有这一项 下面我们从代码的角度解析这个问题:1, 定义被控…

CMSC 216 Exercise #5 Spring 2019Shell Jr (”Shellito”) Due: Tue Apr 23, 2019, 11:30PM1 ObjectivesTo practice fork() and exec by implementing a very simple shell.2 OverviewThe first thing you need to do is to copy the directory shelljr we have left in…

Lab 1 Exercise 3 设置一个断点在地址0x7c00处,这是boot sector被加载的位置.然后让程序继续运行直到这个断点.跟踪/boot/boot.S文件的每一条指令,同时使用boot.S文件和系统为你反汇编出来的文件obj/boot/boot.asm.你也可以使用GDB的x/i指令来获取去任意一个机器指令的反汇编指令,把源文件boot.S文件和boot.asm文件以及在GDB反汇编出来的指令进行比较. 追踪到bootmain函数中,而且还要具体追踪到readsect()子函数…

1.链接地址: http://poj.org/problem?id=1631 http://bailian.openjudge.cn/practice/2787/ 2.题目: 总时间限制: 3000ms 内存限制: 65536kB 描述 给出4个小于10个正整数,你可以使用加减乘除4种运算以及括号把这4个数连接起来得到一个表达式.现在的问题是,是否存在一种方式使得得到的表达式的结果等于24. 这里加减乘除以及括号的运算结果和运算的优先级跟我们平常的定义一致(这里的除法定义是实数除法). 比如,对…

  24.01  JDK5之后的Lock锁的概述和使用 虽然我们可以理解同步代码块和同步方法的锁对象问题,但是我们并没有直接看到在哪里加上了锁,在哪里释放了锁,为了更清晰的表达如何加锁和释放锁,JDK5以后提供了一个新的锁对象Lock   public interface Lock:Lock 实现提供了比使用 synchronized 方法和语句可获得的更广泛的锁定操作.此实现允许更灵活的结构,可以具有差别很大的属性,可以支持多个相关的 Condition 对象.   例: public cla…

这里面说到的一个就是使用循环新建一个字符串时,用到了join(),这个比较高效,常常会随着push(); 绑定某个动作时,可以把要执行的绑定内容定义为一个函数,然后再执行.这样做的好处有很多.第一是可以多次执行,第二是方便调试,第三是方便重构. As a follow-up to “30 HTML and CSS Best Practices”, this week, we’ll review JavaScript! Once you’ve reviewed the list, be sure…

CCNA Exploration: 网络基础知识 (版本 4.0) A few things to keep in mind while completing this activity: 1 Do not use the browser Back button or close or reload any exam windows during the exam. 2 Do not close Packet Tracer when you are done. It will close aut…

1 Introduction 2 Introduction to 2D Graphics Using WPF 3 An Ancient Renderer Made Modern 4 A 2D Graphics Test Bed 5 An Introduction to Human Visual Perception 6 Introduction to Fixed-Function 3D Graphics and Hierarchical Modeling 7 Essential Mathemat…

In the previous post Kafka connect in practice(1): standalone, I have introduced about the basics of kafka connect  configuration and demonstrate a local standalone demo. In this post we will show the knowledge about distributed data pull an sink. To…

剑指offer 面试题24:二叉搜索树的后序遍历序列(的判断) 题目:输入一个整数数组,判断该数组是不是某二叉搜索树的后序遍历的结果.如果是则返回true.否则返回false.假设输入的数组的任意两个数字都互不相同. 提交网址: http://www.nowcoder.com/practice/a861533d45854474ac791d90e447bafd?tpId=13&tqId=11176 二叉搜索树(英语:Binary Search Tree),也称二叉查找树.有序二叉树(英语:orde…

4454: C Language Practice Time Limit: 20 Sec  Memory Limit: 24 MBSubmit: 501  Solved: 112[Submit][Status][Discuss] Description Input 第一行输入一个正整数T(T<=85),表示测试数据的组数. 每组数据第一行包含两个正整数n,m(1<=n,m<=2000),表示序列的长度. 第二行包含n个正整数,表示a[0],a[1],...,a[n-1](0<=a[…

A GIF decoder: an exercise in Go interfaces  一个GIF解码器:go语言接口训练 25 May 2011 Introduction At the Google I/O conference in San Francisco on May 10, 2011, we announced that the Go language is now available on Google App Engine. Go is the first language t…

Today,I start learn new concept english there,Mainly for listening practice and typing speed exercise. 1 Listen to the video and answer the quetion. 2 Listen and typing it,understandind  the main ideals  . 3 speak and  record,make sure pronunciation…

# Author: Ghost # Email: jiaci.liu@gmail.com ''' 1-Review of last week 2-interface class, abstract class 3-packing 4-special methods classmethod staticmethod property 5-reflection ****************** __hasattr__ __getattr__ __setattr__ __delattr__ 6-a…

转自:http://blog.csdn.net/jmq_0000/article/details/7536805#t136 Video for Linux Two API Specification Revision 0.24 Michael H Schimek <mschimek@gmx.at> Bill Dirks Hans Verkuil Martin Rubli Copyright © 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 20…

Step 0: Initialize constants and parameters Step 1: Load data Step 2: Implement softmaxCost Implementation Tip: Preventing overflows - in softmax regression, you will have to compute the hypothesis When the products are large, the exponential functio…

Exercise Session for Introductioninto Computer Science(for non Informatics studies, TUM BWL)(IN8005), WS 2019/2020Sheet 8• Homework are to be worked out independently.• Submission is done via moodle.https://www.moodle.tum.de/course/view.php?id=49786•…

本实验的网站链接:MIT 6.828 Lab 1 Exercise 12. 题目 Exercise 12. Modify your stack backtrace function to display, for each eip, the function name, source file name, and line number corresponding to that eip. In debuginfo_eip, where do __STAB_* come from? This q…

本实验的网站链接:MIT 6.828 Lab 1 Exercise 10. 题目 Exercise 10. To become familiar with the C calling conventions on the x86, find the address of the test_backtrace function in obj/kern/kernel.asm, set a breakpoint there, and examine what happens each time it…

本实验的网站链接:MIT 6.828 Lab 1 Exercise 8. 题目 Exercise 8. Read through kern/printf.c, lib/printfmt.c, and kern/console.c, and make sure you understand their relationship.We have omitted a small fragment of code - the code necessary to print octal numbers u…

本实验的网站链接:mit 6.828 lab1 Exercise 3. 题目 Exercise 3. Take a look at the lab tools guide, especially the section on GDB commands. Even if you're familiar with GDB, this includes some esoteric GDB commands that are useful for OS work. Set a breakpoint at…

PAT (Advanced Level) Practice 1042 Shuffling Machine (20 分) 凌宸1642 题目描述: Shuffling is a procedure used to randomize a deck of playing cards. Because standard shuffling techniques are seen as weak, and in order to avoid "inside jobs" where employ…

March 16, 2016 Problem statement:Given a 2D array (matrix) named M, print all items of M in a spiral order, clockwise.For example: M  =  1   2   3   4   5       6   7   8   9  10      11  12  13  14  15      16  17  18  19  20 The clockwise spiral pr…

Introduction Log files are files that contain messages about the system, including the kernel, services, and applications running on it. There are different log files for different information. For example, there is a default system log file, a log f…

CSharpGL(24)用ComputeShader实现一个简单的图像边缘检测功能 效果图 这是红宝书里的例子,在这个例子中,下述功能全部登场,因此这个例子可作为使用Compute Shader的典型示例. ★用imageLoad从纹理中读取数据.★ ★用imageStore将数据写入纹理.★ ★用vertex/fragment shader显示出compute shader的计算结果.★ 下面是3个测试用例. 下载 CSharpGL已在GitHub开源,欢迎对OpenGL有兴趣的同学加入(ht…