One cold winter evening Alice and her older brother Bob was sitting at home near the fireplace and giving each other interesting problems to solve. When it was Alice's turn, she told the number n to Bob and said: −Shuffle the digits in this number in…

Petr stands in line of n people, but he doesn't know exactly which position he occupies. He can say that there are no less than a people standing in front of him and no more than b people standing behind him. Find the number of different positions Pe…

测试工作流: 运用wf(四)的solution: 创建单元测试项目: 1.选择HelloWorkflow解决方案,右键选择添加新建项目:选择单元测试模板,命名为HelloWorkflow.Tests. 2.右键HelloWorkflow.Tests,添加项目引用,选择HelloWorkflow项目.继续添加引用,添加System.Activities程序集. 3.重命名UnitTest1.cs,改为“SayHelloFixture”. 创建一个测试: 1.在测试类中添加相关引用 using Sy…

题目来源 https://leetcode.com/problems/valid-palindrome/ Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example,"A man, a plan, a canal: Panama" is a palindrome."race a car"…

题目来源 https://leetcode.com/problems/triangle/ Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [ [], [,4], [6,,7], [4,,8,3] ] The min…

题目来源 https://leetcode.com/problems/pascals-triangle-ii/ Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3,Return [1,3,3,1]. 题意分析 Input:integer Output:kth row of the Pascal's triangle Conditions:只返回第n行 题目思路 同118,不…

题目来源 https://leetcode.com/problems/pascals-triangle/ Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1] ] 题意分析 Input:integer Output:帕斯卡三角 Conditions:帕斯卡三…

我们已经在c#和xaml上编写了工作流,或者有的人会觉得在xaml上编写的workflow没什么优点,然而其实xaml其实具有一些很特别的优势. 1. xaml支持工作流设计器,c#不支持: 2. xaml能被动态的加载运行而不需要在一个特定的位置去编译他. 动态工作流能给那些需要生成业务逻辑或者做一个runtime的决定的应用程序提供一些比较好的特性,下面我将讲解怎样实现基于XAML的动态工作流: 1. 运用wf(三)的solution. 2. 修改SayHello.xaml文件属性如下图:…

前言: 到现在我们可以看到,WF4包含一个.xmal 文件的设计器和一个调用活动的runtime.当你创建自己的工作流的时候,你是同时也创建了一个活动, 因为活动是一个继承System.Activities.Activity的类. 活动可以实现业务程序,一些活动实现业务程序通过调用其他的活动,例如SayHello活动不能实现写text到console上,而是通过WriteLine活动去做这个工作. 为了实现这个我们将继承一个不同的基类System.Activities.CodeActivity.…

题目来源 https://leetcode.com/problems/restore-ip-addresses/ Given a string containing only digits, restore it by returning all possible valid IP address combinations. For example:Given "25525511135", return ["255.255.11.135", "255.25…