theory | 易学教程

When do I use a consensus algorithm like Paxos vs using a something like a Vector Clock?

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问题 I've been reading a lot about different strategies to guarantee consistency between nodes in distributed systems, but I'm having a bit of trouble figuring out when to use which algorithm. With what kind of system would I use something like a vector clock? Which system is ideal for using something like Paxos? Are the two mutually exclusive? 回答1: There's a distributed system of 2 nodes that store data. The data is replicated to both nodes so that if one node dies, the data is not lost

When do I use a consensus algorithm like Paxos vs using a something like a Vector Clock?

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When do I use a consensus algorithm like Paxos vs using a something like a Vector Clock?

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MATHEMATICS TRENCH 数学的深渊

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普通人在这儿 Counting 计数 Human Addition 加法 Subtraction 减法 Multiplication 乘法 Basic Geometry 基本几何 Division 除法 Negative Numbers 负数 Order or Operations 运算次序 Decimals 小数 Factors 因子 Fractions 分数 Powers 幂 Radicals 开方 Cartesian Coordinates 笛卡尔坐标 Data Plots 数据绘图 Inational Numbers 无理数 Variables 变量 Equations 方程 Functions 函数坐好，我们要加速了 Elementary Algebra 初等代数 Slope 斜率 Polynomials 多项式 Matrices 矩阵 Complex Numbers 复数 Logarithms 对数 Geometry 几何 Trigonometry 三角学 Radian 弧度 Unit Circle 单位圆 Trig Functions 三角函数 Hyperbolic Functions 双曲函数 Statistics 统计 Calculus 微积分 Limits 极限 Parametric Equations 参数方程 Differentiation 微分

Ehab's REAL Number Theory Problem-CF1325E（补）

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题意：给你一串数，每个数的因子不超过7个，求最少选出多少个数，使得他们的乘积为完全平方数。若无解则输出-1 链接： https://codeforces.com/contest/1325/problem/E 思路：参考博客 https://www.luogu.com.cn/blog/0408Dodgemin/cf1325e-ti-xie# 代码： #include <bits/stdc++.h> using namespace std; typedef long long ll; const int MAXN=1e6+5; const int INF=0x3f3f3f3f3f3f3f; bool notprime[MAXN],visit[MAXN]; int prime[MAXN],tot,a[MAXN]; int head[MAXN],cnt; vector<int>v[MAXN]; int dis[MAXN],ans=INF,max_; struct node { int to,nxt; node(){} node(int x,int y):to(y),nxt(head[x]){} }e[MAXN]; void add(int x,int y) { e[cnt]=node(x,y); head[x]=cnt++; e[cnt]=node(y,x); head[y]=cnt

关于一些大学课程名的中文翻译

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发信人: cameoer (趁年轻多看点comic：）), 信区: job 标题: 课程词汇（全）(转载) 发信站: 饮水思源 (2004年10月13日12:30:06 星期三), 站内信件【以下文字转载自 Translation 讨论区】【原文由 cameoer 所发表】高等数学 Advanced Mathematics 工程数学 Engineering Mathematics 中国革命史 History of Chinese Revolutionary 程序设计 Programming Design 机械制图 Mechanical Drawing 社会学 Sociology 体育 Physical Education 物理实验 Physical Experiments 电路 Circuit 物理 Physics 哲学 Philosophy 法律基础 Basis of Law 理论力学 Theoretical Mechanics 材料力学 Material Mechanics 电机学 Electrical Machinery 政治经济学 Political Economy 自动控制理论 Automatic Control Theory 模拟电子技术基础 Basis of Analogue Electronic Technique 数字电子技术 Digital

Pattern Recognition Books

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From： http://www.ph.tn.tudelft.nl/PRInfo/books.html 原来网站声明： Due to a reorganisation we are not able anymore to maintain these files. They will be removed in the near future. 所以保留一份备用（自己有的或者看的用了红色标注）。 Pattern Recognition Books Below a number of monographs is listed that can be useful for students and researchers in the field of pattern recognition. A list of book announcements received by email can be found here . There is also a general entry on Scientific Publishing Companies . Pattern Recognition and Statistical Learning Neural Networks Machine Learning and Information Theory Image

计算机领域会议排名（Computer Science Conference Rankings）

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自然语言处理、信息检索研究领域属于AI，rank1和rank2的会议都是不错的，值得研究~~~ 要不自己总搞不清自己的领域哪些会议好，哪些论文价值高，感谢bluejade师兄，虽然他可能看不到我在这里写，哈哈网址在： http://www.ntu.edu.sg/home/assourav/crank.htm ，与我相关的是AI领域，已标红 copy如下： Computer Science Conference Rankings DISCLAIMER: The ranking of conferences are taken mostly from an informal external source. The detailed procedure behind the ranking is unknown to the author. These rankings do not necessarily represent my personal view either. There is a possibility that some of the rankings may not be accurate, may not reflect current status of the conferences accurately, may not be complete, and

数百本外文数学E-BOOK免费下载

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Applied Cryptography - http://cacr.math.uwaterloo.ca/hac/ 1996 CRC Handbook of Applied Cryptography by Menezes, van Oorschot and Vanstone in PDF. Trigonometry - http://aleph0.clarku.edu/~djoyce/java/trig/ "Dave's Short Trig Course" by D. E. Joyce. HTML with Java. A=B - http://www.cis.upenn.edu/~wilf/AeqB.html Combinatorics text by Marko Petkovsek, Herbert Wilf and Doron Zeilberger. Published by A. K. Peters. PDF. Wavelets - http://www.amara.com/IEEEwave/IEEEwavelet.html An Introduction to Wavelets by Amara Graps in HTML, PDF or Postscript. Algebraic Topology - http://www.math.cornell.edu/

Shift-reduce: when to stop reducing?

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问题 I'm trying to learn about shift-reduce parsing. Suppose we have the following grammar, using recursive rules that enforce order of operations, inspired by the ANSI C Yacc grammar: S: A; P : NUMBER | '(' S ')' ; M : P | M '*' P | M '/' P ; A : M | A '+' M | A '-' M ; And we want to parse 1+2 using shift-reduce parsing. First, the 1 is shifted as a NUMBER. My question is, is it then reduced to P, then M, then A, then finally S? How does it know where to stop? Suppose it does reduce all the way

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