题目 如果传入字符串是一个有效的美国电话号码,则返回 true. 用户可以在表单中填入一个任意有效美国电话号码. 下面是一些有效号码的例子(还有下面测试时用到的一些变体写法): 555-555-5555 (555)555-5555 (555) 555-5555 555 555 5555 5555555555 1 555 555 5555 在本节中你会看见如 800-692-7753 or 8oo-six427676;laskdjf这样的字符串. 你的任务就是验证前面给出的字符串是否是有效的美国电…

Validate US Telephone Numbers Return true if the passed string is a valid US phone number. The user may fill out the form field any way they choose as long as it is a valid US number. The following are examples of valid formats for US numbers (refer…

function telephoneCheck(str) { // Good luck! //return true; var phone = /^1? ?(\d{3}|\(\d{3}\))[ -]?\d{3}[ -]?\d{4}$/; return phone.test(str); } telephoneCheck("555-555-5555");…

如果传入字符串是一个有效的美国电话号码,则返回 true. 思路:用正则,参考网上资料和js高级程序设计(5.4RegExp类型). let telephoneCheck = str => /^1? ?(\(\d{3}\)|\d{3})[ |-]?\d{3}[ |-]?\d{4}$/.test(str); telephoneCheck("555-555-5555"); 如果有不明白的地方请留言,如果有更好更简便更优化的方法请留言,谢谢. 更多内容请访问我的个人博客:Bblog…

function telephoneCheck(str) { // 祝你好运 //var re = /^1? ?(\(\d{3}\)|\d{3})[ |-]?\d{3}[ |-]?\d{4}$/; //var flag = re.test(str); //return flag; return /^1? ?(\(\d{3}\)|\d{3})[ |-]?\d{3}[ |-]?\d{4}$/.test(str); } 题目: 如果传入字符串是一个有效的美国电话号码,则返回 true. telepho…

Two integers are called "friend numbers" if they share the same sum of their digits, and the sum is their "friend ID". For example, 123 and 51 are friend numbers since 1+2+3 = 5+1 = 6, and 6 is their friend ID. Given some numbers, you…

题目 Notice that the number 123456789 is a 9-digit number consisting exactly the numbers from 1 to 9, with no duplication. Double it we will obtain 246913578, which happens to be another 9-digit number consisting exactly the numbers from 1 to 9, only i…

题意:博弈题面  给出一个数字序列 (>=11)  有两个人任意删除数字 直到 数字只剩下11位 如果删除后的数字串开头是8那么就是第一个赢 否则就是第二个人赢 第一个人先手  数字序列一定是奇数长度 思路: 首先计算一共走多少步 第二个人想赢只有以下两种方法 想法1:如果第二个人能把8都删掉 那么第二个人肯定赢 想法2: 如果删不掉 那么第二个人肯定从前到后尽可能得删掉8 这样使得第一个人的步数不足删除从前到后 步数+1那个8 的其他字符 否则就是第一人赢,直接模拟即可 (比赛的时候一直WA…

(Last modification: 2012-12-17) Textbooks: (1) David Williamson, David Shmoys. The Design of Approximation Algorithms, Cambridge University Press, 2011. (2) Vijay Vazirani. Apporoximation Algorithms. Springer, 2001. (3) Rajeev Motwani, Prabhakar Ragh…

题目 依照一个存着新进货物的二维数组,更新存着现有库存(在 arr1 中)的二维数组. 如果货物已存在则更新数量 . 如果没有对应货物则把其加入到数组中,更新最新的数量. 返回当前的库存数组,且按货物名称的字母顺序排列. 提示 Global Array Object 测试用例 updateInventory() 应该返回一个数组. updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "…

题目 设计一个收银程序 checkCashRegister(),其把购买价格(price)作为第一个参数 , 付款金额 (cash)作为第二个参数, 和收银机中零钱 (cid) 作为第三个参数. cid 是一个二维数组,存着当前可用的找零. 当收银机中的钱不够找零时返回字符串 "Insufficient Funds". 如果正好则返回字符串 "Closed". 否则, 返回应找回的零钱列表,且由大到小存在二维数组中. 提示 Global Object 测试用例 ch…

题目 创建一个函数,接受两个或多个数组,返回所给数组的 对等差分(symmetric difference) (△ or ⊕)数组. 给出两个集合 (如集合 A = {1, 2, 3}和集合 B = {2, 3, 4}), 而数学术语 "对等差分" 的集合就是指由所有只在两个集合其中之一的元素组成的集合(A △ B = C = {1, 4}). 对于传入的额外集合 (如 D = {2, 3}), 你应该安装前面原则求前两个集合的结果与新集合的对等差分集合 (C △ D = {1, 4}…

freecodecamp 高级算法地址戳这里. freecodecamp的初级和中级算法,基本给个思路就能完成,而高级算法稍微麻烦了一点,所以我会把自己的解答思路写清楚,如果有错误或者更好的解法,欢迎留言. Validate US Telephone Numbers 如果传入字符串是一个有效的美国电话号码,则返回 true. 简单来说,美国号码的规则就是,国家代码(必须为1),然后就是3,3,4的数字组合,前三个数字可以用括号包起来.另外就是间隔使用空格或者"-". 因为输入值肯定是字…

Sieve of Eratosthenes (素数筛选算法) Given a number n, print all primes smaller than or equal to n. It is also given that n is a small number. For example, if n is 10, the output should be “2, 3, 5, 7″. If n is 20, the output should be “2, 3, 5, 7, 11, 13,…

it can be solved by Dynamical Programming.Here are some useful link: Tutorial and Code: http://www.cs.cornell.edu/~wdtseng/icpc/notes/dp3.pdfA practice: http://people.csail.mit.edu/bdean/6.046/dp/ (then click Balanced Partition) What's more, please n…

The present invention relates to the field of security of electronic data and/or communications. In one form, the invention relates to data security and/or privacy in a distributed and/or decentralised network environment. In another form, the invent…

By X Wang Update History:Web Version latest update: 4/6/2014PDF Version latest update: 1/16/2014 The following are top 10 algorithms related topics for coding interviews. As understanding those concepts requires much more effort, this list below only…

本文转载自 http://www.ietf.org/rfc/rfc3261.txt 中文翻译可参考 http://wenku.baidu.com/view/3e59517b1711cc7931b71654.html Network Working Group J. Rosenberg Request for Comments: 3261 dynamicsoft Obsoletes: 2543 H. Schulzrinne Category: Standards Track Columbia U.…

vCard The Electronic Business Card Version 2.1 A versit Consortium Specification September 18, 1996 Copyrights © 1996, International Business Machines Corp., Lucent Technologies, Inc., and Siemens. All rights reserved. Permission is granted to copy a…

Welcome Android http://code.google.com/p/imsdroid/ http://code.google.com/p/imsdroid/source/browse/#svn%253Fstate%253Dclosed 3GPP IMS (IP Multimedia Subsystem) is the next generation network for delivering IP multimedia services. IMS is standardized…

catalog . 引言 . sandbox introduction . Sandboxie . seccomp(short for secure computing mode): API级沙箱 . 利用do_syscall_trace一次性对所有系统调用进行Hook监控 . cuckoo . Detux . remnux . Noriben Malware Analysis Sandbox . Limon Sandbox for Analyzing Linux Malwares . 基于do…

Topic Summary Topic: CORRECTIONS: Corrections Topic: DELIVER: Receiving Delivery Topic: DROPSHIP: Drop Shipment Topic: INSPECT: Receiving Inspection Topic: LOT_SERIAL: Lot/Serial Control Topic: ORACLE TIME AND LABOR: OTL Topic: PAY_ON_RCPT: Pay On Re…

File I/O Here is a simple example of file I/O (input/output): # Write a file with open("test.txt", "wt") as out_file: out_file.write("This Text is going to out file\nLook at it and see!") # Read a file with open("test.tx…

博客第一篇写在11月1号,果然die die die die die alone~ 一道不太难的题,白书里被放到排序这一节,半年前用快排A过一次,但是现在做的时候发现可以用字典树加深搜,于是乐呵呵的开始敲了,后来被卡了两天,一直以为算法错了,最后发现是输出答案时忘了回溯,这问题之前没怎么注意过,也算不小的收获. 字典树A了之后换sort来写,没想到快排效率更高,时间减少了一半,在POJ上A了之后重新在UVA上提交,居然WA了,调试半个小时,发现是变长数组的问题,看来UVA上的编译器对c99的支持…

Write an efficient algorithm that searches for a value in an n x m table (two-dimensional array). This table is sorted along the rows and columns — that is, Table[i][j] ≤ Table[i][j + 1], Table[i][j] ≤ Table[i + 1][j] Solution: 1. STEP 方法: Start in t…

Hash function From Wikipedia, the free encyclopedia   A hash function that maps names to integers from 0 to 15. There is a collision between keys "John Smith" and "Sandra Dee". A hash function is any function that maps data of arbitrar…

题目是这样子的 Description Businesses like to have memorable telephone numbers. One way to make a telephone number memorable is to have it spell a memorable word or phrase. For example, you can call the University of Waterloo by dialing the memorable TUT-GL…

BookNote: Refactoring - Improving the Design of Existing Code From "Refactoring - Improving the Design of Existing Code" by Martin Flower. BookNote: Refactoring - Improving the Design of Existing Code Duplicated Code Long Method Large Class Long…

487-3279 Time Limit: 2000MS        Memory Limit: 65536K Total Submissions: 309257        Accepted: 55224 Description Businesses like to have memorable telephone numbers. One way to make a telephone number memorable is to have it spell a memorable wor…

Businesses like to have memorable telephone numbers. One way to make a telephone number memorable is to have it spell a memorable word or phrase. For example, you can call the University of Waterloo by dialing the memorable TUT-GLOP. Sometimes only p…