Description Write a function that add two numbers A and B. Clarification Are a and b both 32-bit integers? Yes. Can I use bit operation? Sure you can. Example Given a=1 and b=2 return 3. Challenge Of course you can just return a + b to get accepted.…

A unival tree (which stands for "universal value") is a tree where all nodes under it have the same value. Given the root to a binary tree, count the number of unival subtrees. For example, the following tree has 5 unival subtrees: 0 / \ 1 0 / \…

I collect and make up this pseudocode from the book: <<Introduction to the Design and Analysis of Algorithms_Second Edition>> _ Anany LevitinNote that throughout the paper, we assume that inputs to algorithms fall within their specified ranges…

Problem A permutation of size N is a sequence of N numbers, each between 0 and N-1, where each number appears exactly once. They may appear in any order. There are many (N factorial, to be precise, but it doesn't matter in this problem) permutations…

Hadamard Transform Hadamard 变换在量子逻辑门中提过,只不过那时是单量子的Hadamard门,负责把\(|1\rangle\)变成\(|-\rangle\),\(|0\rangle\)变成\(|+\rangle\). 那么对多量子的Hadamard门呢? 对于多量子逻辑门,其实说过一句,是单量子逻辑门的张量积. 对于多量子比特的Hadamard门,就是把每一个量子比特都由\(|1\rangle\)变成\(|-\rangle\),\(|0\rangle\)变成\(|+\r…

1 Introduction 可能是因为之前的描述对大多数读者来说太过Greek了,Paxos作为一种实现容错的分布式系统的算法被认为是难以理解的.但事实上,它可能是最简单,最显而易见的分布式算法了.它的本质其实就是共识算法--the "synod" algorithm of.在下一节中我们将展示,该共识算法基本满足了所有我们想要它满足的特性.最后一节则展示了完整的Paxos算法,通过直接应用协商一致的状态虚拟机来构建分布式系统--这种方法应该是广为人知的,因为这可能是分布式系统理论中…

本文转自:http://www.pomdp.org/ 一.Background on POMDPs We assume that the reader is familiar with the value iteration algorithm for regular discrete Markov decision processes (MDPs). However, we will need to differentiate these from POMDPs which we could…

I collect and make up this pseudocode from the book: <<Introduction to the Design and Analysis of Algorithms_Second Edition>> _ Anany LevitinNote that throughout the paper, we assume that inputs to algorithms fall within their specified ranges…

I collect and make up this pseudocode from the book: <<Introduction to the Design and Analysis of Algorithms_Second Edition>> _ Anany Levitin Note that throughout the paper, we assume that inputs to algorithms fall within their specified range…

O(1):constant - the operation doesn't depend on the size of its input, e.g. adding a node to the tail of a linked list where we always maintain a pointer to the tail node.int i=0;i++;++i;i+=6; O(n):linear - the run time complexity is proportionate to…

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直接Ctrl+F 搜索你要找的错 # # Simplified Chinese translation for subversion package # This file is distributed under the same license as the subversion package. # # Update to new pot: # msgmerge --update zh_CN.po subversion.pot # # Check translation: # msgfmt…

I collect and make up this pseudocode from the book: <<Introduction to the Design and Analysis of Algorithms_Second Edition>> _ Anany LevitinNote that throughout the paper, we assume that inputs to algorithms fall within their specified ranges…

传送门 Time Limit: 2 Sec  Memory Limit: 128 MB Description We often use the matrix to analyze reality models. There are lots of algorithm about matrix in Linear Algebra like matrix multiplication, matrix determinant and matrix inversion, etc. Recently,…

Computer Science An Overview _J. Glenn Brookshear _11th Edition Universal Programming Languages In  Chapter  6  we  studied  a  variety  of  features  found  in  high-level  programminglanguages. In this section we apply our knowledge of computabilit…

Problem Link: http://oj.leetcode.com/problems/best-time-to-buy-and-sell-stock-iii/ Linear Time Solution We try to solve this problem in O(n) time in the help of the algorithm in Best Time to Buy and Sell Stock, which can return the max profit by give…

Problem link: http://oj.leetcode.com/problems/linked-list-cycle/ We set two pointers: the faster pointer goes two steps each iteration, and the slower one goes one step. If the two pointers meet some time, it follows that there is a loop; otherwise,…

約瑟夫問題的兩個O(log n)解法 這個是學習編程時的一個耳熟能詳的問題了: n個人(編號爲0,1,...,n-1)圍成一個圈子,從0號開始依次報數,每數到第m個人,這個人就得自殺, 之後從下個人開始繼續報數,直到所有人都死亡爲止.問最後一個死的人的編號(其實看到別人都死了之後最後剩下的人可以選擇不自殺……). 這個問題一般有兩種問法: 給出自殺順序.不少數據結構初學書都會以這個問題爲習題考驗讀者對線性表的掌握. 比較常見的解法是把所有存活的人組織成一個循環鏈表,這樣做時間複雜度是O(n*m)…

Paper about Event Detection. #@author: gr #@date: 2014-03-15 #@email: forgerui@gmail.com 看一些相关的论文. 1. <Efficient Visual Event Detection using Volumetric Features> ICCV 2005 扩展2D box 特征到3D时空特征. 构建一个实时的检测器基于容积特征. 采用传统的兴趣点方法检测事件. 2. <ARMA-HMM: A New…

发信人: fennec (fennec), 信区: Algorithm 标 题: acm 总结 by fennec 发信站: 吉林大学牡丹园站 (Wed Dec 8 16:27:55 2004) ACM总结(fennec) 其实在北京比赛完的时候,我就想写了,不过还是早了点,直到上海比赛结束,大家的心中都不是太好受.郭老师有句话:你们这样做也是对的,不成功就成仁.让我的心也能安慰了不少. 我是从大一下学期开始接触ACM的,那时候我们学校才刚刚起步,siyee,wjiang师兄可以说是我的领路人了…

Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transaction (ie, buy one and sell one share of the stock), design an algorithm to find the maximum profit. [Tho…

轨道力学中二体问题下求解兰伯特方程. 老外写的Matlab程序,我把它转成了Fortran程序. !***************************************************************** subroutine solve_lambert(r1,r2,tt,GM,lw,N,nBranch,v1,v2) implicit real(8)(A-H,O-Z) dimension r1(3),r2(3),v1(3),v2(3),tmp3(3),wih(3),r1…

Greedy Change time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Billy investigates the question of applying greedy algorithm to different spheres of life. At the moment he is studying the ap…

Introduction Divide-and-Conquer的三个步骤: Divide the problem into a number of subproblems that are smaller instances of the same problem. Conquer the subproblems by solving them recursively. If the subproblem sizes are small enough, however, just solve t…

读第二遍了,感觉和几年前读时的收获不一样了.送上门来当树洞的独自承担一切 Redis以简洁为美Redis通信协议是Redis客户端与Redis之间交流的语言,通信协议规定了命令和返回值的格式.Redis支持两种难住协议,一种是二进制安全的统一请求(unified request protocal),另一种是比较直观的便于在telnet程序中输入的简单协议.这两种协议只是命令的格式有区别,命令返回值的格式是一样的. 1.修改配置文件Redis的配置文件默认在/etc/redis.conf,找到如下…

https://www.quora.com/How-do-I-learn-machine-learning-1?redirected_qid=6578644   How Can I Learn X? Learning Machine Learning Learning About Computer Science Educational Resources Advice Artificial Intelligence How-to Question Learning New Things Lea…

Strange Towers of Hanoi Time Limit: 1000MS Memory Limit: 30000K Total Submissions: 3784 Accepted: 2376 Description Background  Charlie Darkbrown sits in another one of those boring Computer Science lessons: At the moment the teacher just explains the…

Problem Statement 描述 一日,崔克茜来到小马镇表演魔法. 其中有一个节目是开锁咒:舞台上有 n 个盒子,每个盒子中有一把钥匙,对于每个盒子而言有且仅有一把钥匙能打开它.初始时,崔克茜将会随机地选择 k 个盒子用魔法将它们打开.崔克茜想知道最后所有盒子都被打开的概率,你能帮助她回答这个问题吗? 输入 第一行一个整数$T$ ($T \leq 100$)表示数据组数. 对于每组数据,第一行有两个整数$n$和$k$ ($1 \leq n \leq 300, 0 \leq k \leq …

Strange Towers of Hanoi Time Limit: 1000MS Memory Limit: 30000K Total Submissions: 2677 Accepted: 1741 Description Background Charlie Darkbrown sits in another one of those boring Computer Science lessons: At the moment the teacher just explains the…

A Complete Tutorial to Learn Data Science with Python from Scratch Introduction It happened few years back. After working on SAS for more than 5 years, I decided to move out of my comfort zone. Being a data scientist, my hunt for other useful tools w…