网络安全 第三章 Internet协议的安全性

3.1 Internet 协议概述

TCP / IP 协议族

  • 网络接口层
    • TCP / IP 模型的最底层
  • 网际层
    • IP、ARP
  • 传输层
    • TCP、UDP
  • 应用层
    • HTTP、SMTP、POP3、FTP

POJ3684 Physics Experiment

Description

Simon is doing a physics experiment with N identical balls with the same radius of R centimeters. Before the experiment, all N balls are fastened within a vertical tube one by one and the lowest point of the lowest ball is H meters above the ground. At beginning of the experiment, (at second 0), the first ball is released and falls down due to the gravity. After that, the balls are released one by one in every second until all balls have been released. When a ball hits the ground, it will bounce back with the same speed as it hits the ground. When two balls hit each other, they with exchange their velocities (both speed and direction).

POJ3279 Fliptile

Description

Farmer John knows that an intellectually satisfied cow is a happy cow who will give more milk. He has arranged a brainy activity for cows in which they manipulate an M × N grid (1 ≤ M ≤ 15; 1 ≤ N ≤ 15) of square tiles, each of which is colored black on one side and white on the other side.

网络安全 第二章 计算机网络基础知识

2.1 计算机网络的定义

将处于不同位置并具有独立功能的多个计算机系统通过通信线路网络设备连接起来,以实现网络资源共享, 此系统称为计算机网络

网络安全 第一章 引言

1.1 对网络安全需求

网络发展态势:计算机病毒、黑客攻击、系统漏洞、信息战

网络安全需求: - 敏感信息对安全的需求 - 信息密级:秘密级、机密级、绝密级 - 敏感非机密信息 - 网络应用对安全的需求

工程伦理 第三章 作为方法的伦理理论

3.1 遭遇伦理困境

伦理困境:

  • 存在两种或更多的道德责任、义务、权利、善、或一种价值理念与另一价值理念发生冲突
  • 在某一种特定的工程实践情形中,一种道德原则存在两种或两种以上不相容的应用方式
  • 人类生活本身的复杂性以及价值标准的多元化,使得工程实践的伦理困境常常具有一种不确定性,即我们往往不能在正确与错误、是与非之间进行抉择

POJ3276 Face The Right Way

Description

Farmer John has arranged his N (1 ≤ N ≤ 5,000) cows in a row and many of them are facing forward, like good cows. Some of them are facing backward, though, and he needs them all to face forward to make his life perfect.

编译原理 第四章 自上而下语法分析

4.1 概述

语法分析的本质:是按文法的产生式,识别输入符号串是否为一个句子。即是否能从文法的开始符号出发推导出这 个输入串,或者建立一棵与输入串相匹配的语法分析树。

POJ2010 Moo University - Financial Aid

Description

Bessie noted that although humans have many universities they can attend, cows have none. To remedy this problem, she and her fellow cows formed a new university called The University of Wisconsin-Farmside,"Moo U" for short.

priority_queue 的使用(C++)

能够完成下列操作的数据结构叫作:priority_queue ,即优先队列。

  • 插入一个数值
  • 去除最小(大)的数值(获得数值,并且删除)
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