这个题目一开始不知道如何下手,感觉很像背包,里面有两个变量,一个带宽B,一个价格P,有n个设备,每个设备有k个可选的器材(只需选一个),每个器材都有自己的B和P, n个设备选n个器材,最终,FB=所有器材里最小的B,FP=总的价格,要使得FB/FP最大 这种题目得先把一个变量给控制起来,或者说枚举其中一个变量之后,再通过dp的方法得到另一个变量的最优值,千万别想一步登天 像这个题目,我们如果先把每个设备对应的器材按价格升序排序,然后我枚举可能的FB,对于每个设备,我从前往后扫,一旦扫到了B>=F…

/*如果要一个物体的多种属性,最好用结构体,不要用二维数组或者多维数组.用多维数组进行关键字排序很不稳定 */ /*给每个设备的所有价格排序,每个设备选取恰好比已知带宽大的价格(这个时候的比例最大) 循环每个设备就得到所有价格综合 然后得到该带宽下的B/P 比较所有带宽的B/P 选取最大的就是所求的*/ #include <stdlib.h> #include <stdio.h> #define true 1 #define false 0 typedef struct { int…

例如,“三国人物是否智力越高,政治就越高”,或是“是否武力越高,统率也越高:准备数据分析环境: SELECT * FROM FactSanguo11 WHERE 姓名 IN ( N'荀彧', N'荀攸', N'贾诩', N'程昱', N'郭嘉' ) 曹魏五谋臣,指荀彧.荀攸.贾诩.程昱.郭嘉五人.因为这五个人对曹魏势力的成立与巩固有巨大贡献,所以,把他们叫做曹魏五谋臣.“智力”和“政治”的散布图 做成图表后,我们就可以知道它们是否与双变量相关联.但是!关联性究竟有多高呢?很可惜!我们无法确切得知…

Communication System Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 25006 Accepted: 8925 Description We have received an order from Pizoor Communications Inc. for a special communication system. The system consists of several devices. For…

点击打开链接 Communication System Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 21007   Accepted: 7449 Description We have received an order from Pizoor Communications Inc. for a special communication system. The system consists of several d…

Communication System Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 21631   Accepted: 7689 Description We have received an order from Pizoor Communications Inc. for a special communication system. The system consists of several devices.…

有时,我们需要设计个滤波器滤除特定一个频率的噪音.这时就需要陷波滤波器了. 陷波器是带阻滤波器的一种,带阻滤波器的滤除频率有一定宽度,而陷波就是对某一个频率噪音的滤除. 双T型陷波滤波器应该是最常见的陷波滤波器,下面就简单介绍一下这种滤波器的特性. 最基本双T型结构如图1所示. 图 1 双T型基本结构 上图中各器件的值要满足如下的关系. C1=C2=C,C3=2C. R1=R2=R,R3=R/2 对上图中的电路列写电路方程如下: 略加计算可以得到: 可以看出上面的式子都是典型的二阶系统.所以有下…

Description We have received an order from Pizoor Communications Inc. for a special communication system. The system consists of several devices. For each device, we are free to choose from several manufacturers. Same devices from two manufacturers d…

We have received an order from Pizoor Communications Inc. for a special communication system. The system consists of several devices. For each device, we are free to choose from several manufacturers. Same devices from two manufacturers differ in the…

We have received an order from Pizoor Communications Inc. for a special communication system. The system consists of several devices. For each device, we are free to choose from several manufacturers. Same devices from two manufacturers differ in the…