源代码\用动态规划算法计算序列关系个数 用关系"<"和"="将3个数a,b,c依次序排列时,有13种不同的序列关系: a=b=c,a=b<c,a<b=v,a<b<c,a<c<b a=c<b,b<a=c,b<a<c,b<c<a,b=c<a c<a=b,c<a<b,c<b<a 若要将n个数依序列,设计一个动态规划算法,计算出有多少种不同的序列关系, 要求算法只占用O(n),只耗时O(n*n).
上传时间: 2013-12-26
上传用户:siguazgb
The government of a small but important country has decided that the alphabet needs to be streamlined and reordered. Uppercase letters will be eliminated. They will issue a royal decree in the form of a String of B and A characters. The first character in the decree specifies whether a must come ( B )Before b in the new alphabet or ( A )After b . The second character determines the relative placement of b and c , etc. So, for example, "BAA" means that a must come Before b , b must come After c , and c must come After d . Any letters beyond these requirements are to be excluded, so if the decree specifies k comparisons then the new alphabet will contain the first k+1 lowercase letters of the current alphabet. Create a class Alphabet that contains the method choices that takes the decree as input and returns the number of possible new alphabets that conform to the decree. If more than 1,000,000,000 are possible, return -1. Definition
标签: government streamline important alphabet
上传时间: 2015-06-09
上传用户:weixiao99
上下文无关文法(Context-Free Grammar, CFG)是一个4元组G=(V, T, S, P),其中,V和T是不相交的有限集,S∈V,P是一组有限的产生式规则集,形如A→α,其中A∈V,且α∈(V∪T)*。V的元素称为非终结符,T的元素称为终结符,S是一个特殊的非终结符,称为文法开始符。 设G=(V, T, S, P)是一个CFG,则G产生的语言是所有可由G产生的字符串组成的集合,即L(G)={x∈T* | Sx}。一个语言L是上下文无关语言(Context-Free Language, CFL),当且仅当存在一个CFG G,使得L=L(G)。 *⇒ 例如,设文法G:S→AB A→aA|a B→bB|b 则L(G)={a^nb^m | n,m>=1} 其中非终结符都是大写字母,开始符都是S,终结符都是小写字母。
标签: Context-Free Grammar CFG
上传时间: 2013-12-10
上传用户:gaojiao1999
We have a group of N items (represented by integers from 1 to N), and we know that there is some total order defined for these items. You may assume that no two elements will be equal (for all a, b: a<b or b<a). However, it is expensive to compare two items. Your task is to make a number of comparisons, and then output the sorted order. The cost of determining if a < b is given by the bth integer of element a of costs (space delimited), which is the same as the ath integer of element b. Naturally, you will be judged on the total cost of the comparisons you make before outputting the sorted order. If your order is incorrect, you will receive a 0. Otherwise, your score will be opt/cost, where opt is the best cost anyone has achieved and cost is the total cost of the comparisons you make (so your score for a test case will be between 0 and 1). Your score for the problem will simply be the sum of your scores for the individual test cases.
标签: represented integers group items
上传时间: 2016-01-17
上传用户:jeffery
无需记录销往单位,无需填制销售货凭证,在计算机管理系统中为了分类统计客户群,可对某类客户做一标识,并且可由打印机打印出销售小票
上传时间: 2016-01-23
上传用户:Miyuki
The XML Toolbox converts MATLAB data types (such as double, char, struct, complex, sparse, logical) of any level of nesting to XML format and vice versa. For example, >> project.name = MyProject >> project.id = 1234 >> project.param.a = 3.1415 >> project.param.b = 42 becomes with str=xml_format(project, off ) "<project> <name>MyProject</name> <id>1234</id> <param> <a>3.1415</a> <b>42</b> </param> </project>" On the other hand, if an XML string XStr is given, this can be converted easily to a MATLAB data type or structure V with the command V=xml_parse(XStr).
标签: converts Toolbox complex logical
上传时间: 2016-02-12
上传用户:a673761058
这是PXI的软硬件设计规范,如果需要开发基于PXI平台的计算机测试系统板卡,则非常有用。
上传时间: 2013-12-27
上传用户:123456wh
由于小型图书馆规模较小,资金投入有限,学校从实际需要出发,本着真题真做的态度来开发适合小型图书馆工作特点的图书馆计算机管理系统。本文主要介绍了佛山电大小型图书馆微机采编管理系统的功能及其开发情况,具体阐述了图书采购子系统、图书编目子系统、查询模块、打印模块的数据流图、数据结构以及系统的设计思想,论述了应用Visual Basic 6.0、Microsoft SQL Server 2000等软件开发《小型图书馆微机采编管理系统》的实现方法和系统实现的主要关键技术
上传时间: 2013-12-25
上传用户:钓鳌牧马
单片机控制步进电机,:步进电动机由于其性能优越、控制精度高,被广泛应用于数控机床,绘图仪,自动化仪表及机械模型 等。而单片计算机是最常用的微控制器。介绍两种应用于单片计算机控制系统的步进电机驱动电路。
上传时间: 2016-08-31
上传用户:wangchong
仿WinRar解压缩VB版 这个示例就是利用这个动态链接库进行的一些操作,但目前还没有压缩文件的功能,里面的dll函数接口还需要进一步的解析和查找资料,官方好像也没有提供,希望有知道的网友也可以提供一下。更希望感兴趣的网友继续进行挖掘和开发。 源代码附有详细的注释和文档说明。使用前请把压缩包里的 UnRar.dll拷贝到你的计算机的系统文件夹下,如 Windows\System32下。
上传时间: 2013-12-28
上传用户:aix008