张大大123

摘要：按照XMPPFramework的官方样例，应该把登录代码放置在AppDelegate中，并且让注销成为私有方法。 XMPPFramework进行登录的步骤如下： ①连接主机，并且发送JID ②如果连接成功，则发送密码进行授权 ③授权成功后，发送上线消息 ④如果要注销，发送下线消息，并且断开连接。... 阅读全文

摘要：首先下载XMPPFramework框架，将Vendor内容导入到工程中，其中KissXML需要额外的框架，需要通过Xcode设置。 选择工程选项中TARGETS的General标签，最下侧有Linked Frameworks and Libraries，导入libxml2.dylib: 接着选... 阅读全文

摘要：假设数据放置在self.chatMessage数组内，只需要让tableView滚动到最后一条数据底部即可，调用scrollToRowAtIndexPath方法： [_tableView reloadData];// 实现数据超过一屏时滚动到底部。NSIndexPath *lastPath = ... 阅读全文

摘要：本文介绍使用GCDAsyncSocket来实现iOS端的socket，有关简易服务端的代码已经在上一篇文章中提到，这里不再赘述，将直接介绍如何实现客户端。 首先下载CocoaAsyncSocket框架，如果下载过iOS的XMPP框架，在Vendor中有这个框架，将框架导入工程，并包含其头文件GC... 阅读全文

摘要：对于微博、微信朋友圈之类的网络通信，使用JSON完全可以满足需求，但是如果要制作网络游戏，就需要建立一个持久连接，这时候就要考虑使用socket。 在iOS上实现socket大体有两种方法，一是借助自带的输入输出流和C语言socket相结合，二是利用第三方类库CocoaAsyncSocket，本... 阅读全文

摘要：题目如下： To prepare for PAT, the judge sometimes has to generate random passwords for the users. The problem is that there are always some confusing ... 阅读全文

摘要：题目如下： This time you are asked to tell the difference between the lowest grade of all the male students and the highest grade of all the female stu... 阅读全文

摘要：题目如下： The magic shop in Mars is offering some magic coupons. Each coupon has an integer N printed on it, meaning that when you use this coupon wit... 阅读全文

摘要：题目如下： Given a collection of number segments, you are supposed to recover the smallest number from them. For example, given {32, 321, 3214, 0229, 8... 阅读全文

摘要：题目如下： One way that the police finds the head of a gang is to check people's phone calls. If there is a phone call between A and B, we say that A a... 阅读全文

摘要：题目如下： Given any string of N (>=5) characters, you are asked to form the characters into the shape of U. For example, "helloworld" can be printed a... 阅读全文

摘要：题目如下： To store English words, one method is to use linked lists and store a word letter by letter. To save some space, we may let the words share th... 阅读全文

摘要：题目如下： With highways available, driving a car from Hangzhou to any other city is easy. But since the tank capacity of a car is limited, we have to ... 阅读全文

摘要：题目如下： Given an increasing sequence S of N integers, the median is the number at the middle position. For example, the median of S1={11, 12, 13, 14... 阅读全文

摘要：题目如下： Excel can sort records according to any column. Now you are supposed to imitate this function. Input Each input file contains one test case.... 阅读全文

摘要：题目如下： People in Mars represent the colors in their computers in a similar way as the Earth people. That is, a color is represented by a 6-digit nu... 阅读全文

摘要：小记一下。 因为全面转向 Python 3.4 作为主力开发版本，但是手上的 Mac OS X 和服务器上用的都是 Python 2.7，所以需要安装 pyenv。 按其 github 页面的说明，使用 homebrew 安装brew updatebrew install pyen... 阅读全文

摘要：对于超大数字的运算，用long long int仍然不能解决，这时候就需要考虑通过模拟运算和数组存储来实现高精度运算。 本文讨论借助C++的string来实现高精度的运算。 首先输入的量直接存储为string，设为s1和s2。 接下来设计一个反转函数，用于把整个字符串反转（为了方便后续计算）。 ... 阅读全文

摘要：题目如下： Programming Ability Test (PAT) is organized by the College of Computer Science and Technology of Zhejiang University. Each test is supposed ... 阅读全文

摘要：可以利用并查集或者带颜色标记的BFS（来自算法导论）判断。 首先介绍第一种，用并查集来判断： 首先初始化所有元素的根为-1，-1代表根节点，接下来对于图中的每一条边(v1,v2)都并入集合，并入的方式为查找v1和v2的根节点，然后让v2的根节点作为v1的根节点，查找根节点的过程为：如果当前的结点... 阅读全文

摘要：题目如下： A graph which is connected and acyclic can be considered a tree. The height of the tree depends on the selected root. Now you are supposed t... 阅读全文