对于符号三角形问题，符号三角形的第一行有n个符号。符号可以为“＋”或“－”，以下每一行的符号由上行得到，2个同号下面都是“+”，2个异号下面都是“－”。如下图所示（第一行有4个符号的符号三角中的其中的一个）： 符号三角形问题要求对于给定的n，计算有多少个不同的符号三角形，使其所含的“＋”和“－”的个数相同。 Input 输入包含若干个测试用例。 对于每个测试用例，输入的一行是一个整数n(2<=n<=20)，表示符号三角形第一行符号的个数。当输入n为0时表示输入结束。 Output 对于每个测试案例，输出包括一行，这一行只包含一个整数，就是该测试案例总共有多少不同的符号三角形，使其所含的“＋”和“－”的个数相同。 Sample Input 2 3 0 Sample Output 0 4
上传时间： 2014-01-02
上传用户：阳光少年2016
Problem F:汽车加油 Time Limit:1000MS Memory Limit:65536K Total Submit:1400 Accepted:404 Language: not limited Description 一辆汽车加满油后可行驶n公里。旅途中有若干个加油站。设计一个有效算法，指出应在哪些加油站停靠加油，使沿途加油次数最少。 编程任务： 对于给定的n和k(k <= 10000)个加油站位置，编程计算最少加油次数。 Input 第一行有2 个正整数n和k，表示汽车加满油后可行驶n公里，且旅途中有k个加油站。接下来的1 行中，有k+1 个整数，表示第k个加油站与第 k-1 个加油站之间的距离。第0 个加油站表示出发地，汽车已加满油。第k+1 个加油站表示目的地。 Output 输出最少加油次数。如果无法到达目的地，则输出”No Solution”。 Sample Input 7 7 1 2 3 4 5 1 6 6 Sample Output 4
标签： Limit Accepted Language Problem
上传时间： 2016-04-12
上传用户：youth25
In this letter, the error performance of an ultra-wideband (UWB) system with a hybrid pulse amplitude and position modulation (PAPM) scheme over indoor lognormal fading channels is analyzed. In the PAPM UWB system, input data is modulated onto both the pulse amplitudes and pulse positions.
标签： ultra-wideband performance amplitud letter
上传时间： 2014-01-08
上传用户：yulg
In this demo, I use the EM algorithm with a Rauch-Tung-Striebel smoother and an M step, which I ve recently derived, to train a two-layer perceptron, so as to classify medical data (kindly provided by Steve Roberts and Will Penny from EE, Imperial College). The data and simulations are described in: Nando de Freitas, Mahesan Niranjan and Andrew Gee Nonlinear State Space Estimation with Neural Networks and the EM algorithm After downloading the file, type "tar -xf EMdemo.tar" to uncompress it. This creates the directory EMdemo containing the required m files. Go to this directory, load matlab5 and type "EMtremor". The figures will then show you the simulation results, including ROC curves, likelihood plots, decision boundaries with error bars, etc. WARNING: Do make sure that you monitor the log-likelihood and check that it is increasing. Due to numerical errors, it might show glitches for some data sets.
标签： Rauch-Tung-Striebel algorithm smoother which
上传时间： 2016-04-15
上传用户：zhenyushaw
北京大学ACM题 Here is a geometric problem. You have an angle and some squares in the first quadrant of the plane rectangular coordinates. The vertex of the angle is fixed on the origin O of the coordinates, and both of its radial lines are specified by the input. The sizes of the squares are also specified by the input, and the squares can shift vertically and horizontally. Now your job is to use the squares and the radial lines of the angle to enclose the maximum area, which excludes the area of the squares (see Figure 1). You should note that the edges of the squares must be parallel to the axes.
标签： geometric quadrant problem squares
上传时间： 2013-12-25
上传用户：ynzfm
北京大学ACM比赛题目 In 1742, Christian Goldbach, a German amateur mathematician, sent a letter to Leonhard Euler in which he made the following conjecture: Every even number greater than 4 can be written as the sum of two odd prime numbers. For example: 8 = 3 + 5. Both 3 and 5 are odd prime numbers. 20 = 3 + 17 = 7 + 13. 42 = 5 + 37 = 11 + 31 = 13 + 29 = 19 + 23. Today it is still unproven whether the conjecture is right. (Oh wait, I have the proof of course, but it is too long to write it on the margin of this page.) Anyway, your task is now to verify Goldbach s conjecture for all even numbers less than a million.
标签： mathematician Christian Goldbach Leonhard
上传时间： 2016-04-22
上传用户：wangchong
PlotSphereIntensity(azimuth, elevation) PlotSphereIntensity(azimuth, elevation, intensity) h = PlotSphereIntensity(...) Plots the intensity (as color) of a number of points on a unit sphere. Input: azimuth (phi), in degrees elevation (theta), in degrees intensity (optional, if not provided, a green sphere is produced) All inputs must be vectors or matrices of the same size. Data does not have to be evenly spaced. When there aren t enough points to draw a smooth sphere, additional points (with color) are interpolated. Output: h - a handle to the patch object The axes are also plotted: positive x axis is red positive y axis is green positive z axis is blue
标签： PlotSphereIntensity elevation azimuth intensity
上传时间： 2014-01-15
上传用户：ruan2570406
A technical trading system comprises a set of trading rules that can be used to generate trading signals. In general, a simple trading system has one or two parameters that determine the timing of trading signals. Each rule contained in a trading system is the results of parameterizations. (Source: The Profitability of Technical Analysis: A Review by Cheol-Ho Park and Scott H. Irwin)
标签： trading technical comprises generate
上传时间： 2013-12-25
上传用户：tianyi223
无线传感器网络的主要功能是实现数据发布,在接收到信息查询时能够以有效的方式传输给查询者.目前的数据发布方式通常基于洪泛机制查询信息,浪费了有限的能源.虽然一些最近的数据发布协议从不同程度上解决了这一问题,但不能保证查询成功率.基于圆形节点分布网络模型提出了一种既能减少能源消耗,又能提高成功率的数据发布模式——直径-弦模式DCS(diameter-chord scheme).该模式利用了每个圆的弦都存在一个直径与之垂直相交的性质.在此基础上提出了Two-Phase协议.它在信息查询时分成两个工作方式不同的阶段进行,在第1段查询不中时触发第2段查找.为了减少Two-Phase的延迟,提出了基于优先级和概率转发两种解决方法.理论分析和实验结果都表明,所提出的数据发布协议具有较好的性能.
上传时间： 2016-04-29
上传用户：李梦晗
Matrix Transposition and Multiplication It is a MIPS assembly program that does the following: given two matrices, M1 and M2, first transpose M2 to obtain M2tran. Then multiply M1 and M2tran.
标签： Multiplication Transposition following assembly
上传时间： 2016-05-03
上传用户：kernaling
