A Plug for UNIX Description You are in charge of setting up the press room for the inaugural meeting of the United Nations Internet eXecutive (UNIX), which has an international mandate to make the free flow of information and ideas on the Internet as…

Nightmare Problem Description Ignatius had a nightmare last night. He found himself in a labyrinth with a time bomb on him. The labyrinth has an exit, Ignatius should get out of the labyrinth before the bomb explodes. The initial exploding time of th…

A Plug for UNIX Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 14786 Accepted: 4994 Description You are in charge of setting up the press room for the inaugural meeting of the United Nations Internet eXecutive (UNIX), which has an interna…

Safecracker Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 10165 Accepted Submission(s): 5213 Problem Description === Op tech briefing, 2002/11/02 06:42 CST === "The item is locked in a Klein saf…

UIkit动力学是UIkit框架中模拟真实世界的一些特性. UIDynamicAnimator 主要有UIDynamicAnimator类,通过这个类中的不同行为来实现一些动态特性. 它一般有两种初始化方法,先讲常见的第一种 ? 1 animator= [[UIDynamicAnimator alloc] initWithReferenceView:self.view]; 动态特性的实现主要依靠它所添加的行为,通过以下方法进行添加和移除, ? 1 2  [animator addBehavior…

最近做的项目中,有一个类似微博中的评论转发功能,屏幕底端有一个输入框用textView来做,当textView成为第一响应者的时候它的Y值随着键盘高度的改变而改变,保证textView紧贴着键盘,但又不会被键盘挡住. 下面是我实现的方法:(利用通知) 1 2 3 4 5 6 7 8 9 10 11 12 // 键盘通知     // 键盘的frame发生改变时发出的通知(位置和尺寸)     //    UIKeyboardWillChangeFrameNotification     //  …

Truck History Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 27335   Accepted: 10634 Description Advanced Cargo Movement, Ltd. uses trucks of different types. Some trucks are used for vegetable delivery, other for furniture, or for bric…

Ranking System Time Limit: 2 Seconds      Memory Limit: 65536 KB Few weeks ago, a famous software company has upgraded its instant messaging software. A ranking system was released for user groups. Each member of a group has a level placed near his n…

for the backtracking part, thanks to the video of stanford cs106b lecture 10 by Julie Zelenski for the nice explanation of recursion and backtracking, highly recommended. in hdu 2553 cout N-Queens solutions problem, dfs is used. // please ignore, bel…

Maya Calendar Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 70016   Accepted: 21547 Description During his last sabbatical, professor M. A. Ya made a surprising discovery about the old Maya calendar. From an old knotted message, profes…