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…

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…

个人心得:百度推荐的简单DP题,自己做了下发现真得水,看了题解发现他们的思维真得比我好太多太多, 这是一段漫长的锻炼路呀. 关于这道题,我最开始用DP的思路,找子状态,发现自己根本就不会找DP状态数组建立,怎么找都是被后面的给打乱了, 看到了网上的DP[i][j],i表示前几个设备,宽带为j的最少花费,哇,真得厉害,突然发现动态规划并不需要做到问题很完美, 其实只要解决方案能够顺带把这个解决就好了. 他的这个转移方程就是,当i等于1时,输入的想,输入的x,y(x表示宽带长度,y表示价格)dp[i…

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.…

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…

Communication System Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 22380   Accepted: 7953 Description We have received an order from Pizoor Communications Inc. for a special communication system. The system consists of several devices.…

  Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 26738   Accepted: 9546 Description We have received an order from Pizoor Communications Inc. for a special communication system. The system consists of several devices. For each device, w…

http://poj.org/problem?id=1018 题意: 某公司要建立一套通信系统,该通信系统需要n种设备,而每种设备分别可以有m1.m2.m3.....mn个厂家提供生产,而每个厂家生产的同种设备都会存在两个方面的差别:带宽bandwidths 和 价格prices. 现在每种设备都各需要1个,考虑到性价比问题,要求所挑选出来的n件设备,要使得B/P最大. 其中B为这n件设备的带宽的最小值,P为这n件设备的总价. 思路:DP解决. d[i][j]代表选择第i个设备时最小带宽j时的价…

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…

http://acm.zju.edu.cn/onlinejudge/showContestProblem.do?problemId=5565 Course Selection System Time Limit: 1 Second      Memory Limit: 65536 KB There are n courses in the course selection system of Marjar University. The i-th course is described by t…

http://poj.org/problem?id=1018 (题目链接) 题意 要买n个产品,每个产品有m种价格和宽度(我也不知道翻译过来到底是什么?),设n个产品的宽度的最小值为B,n个产品的价格和为P,要求B/P最大. Solution dp.题目没说B的取值范围,坑死了. f[i][j]表示前i个产品,当B为j时的最小价格. 转移很好转,具体见代码. 代码 // poj1018 #include<algorithm> #include<iostream> #include&…

题意: 有一个\(base(2 \leq base \leq 6)\)进制系统,这里面的数都是整数,不含前导0,相邻两个数字不相同. 而且每个数字有一个得分\(score(1 \leq score \leq 10^9)\),得分为 相邻两个数字之差的平方之和. 给出\(base\)和\(score\),求满足条件的整数的个数 \(mod \, 2^{32}\). 分析: 首先考虑DP的做法: 设\(dp(i, j)\)表示满足当前分数为\(i\)最后一个数字是\(j\)的数字的个数. 递推就是枚…

本题一看似乎是递归回溯剪枝的方法.我一提交,结果超时. 然后又好像是使用DP,还可能我剪枝不够. 想了非常久,无奈忍不住偷看了下提示.发现方法真多.有贪心,DP,有高级剪枝的.还有三分法的.八仙过海各显神通啊. 坏习惯了,没思考够深入就偷看提示了. 幸好及时回头,还不须要看别人的代码了.自己做出来之后,有空看看多种解法的代码也好. 然后我想出自己的思路了,使用贪心,剪枝,DP综合优化下,呵呵.最后程序有点复杂.优化到了16ms,运气好点,或者vector换成原始数组的话,应该能够0MS了. 整体…

Handover: 切换,属于移动通信网络中的技术术语. 所谓切换,就是指当移动台在通话过程中从一个基站覆盖区移动到另一个基站覆盖区,或者由于外界干扰而造成通话质量下降时,必须改变原有的话音信道而转接到一条新的空闲话音信道上去,以继续保持通话的过程.切换是移动通信系统中一项非常重要的技术,切换失败会导致掉话,影响网络的运行质量.因此,切换成功率(包括切入和切出)是网络考核的一项重要指标,如何提高切换成功率,降低切换掉话率是网络优化工作的重点之一. 小区更新 是手机在通话状态下,由于无线环境或者是…

poj1018:http://poj.org/problem?id=1018 题意:某公司要建立一套通信系统,该通信系统需要n种设备,而每种设备分别可以有m1.m2.m3.....mn个厂家提供生产,而每个厂家生产的同种设备都会存在两个方面的差别:带宽bandwidths 和 价格prices.现在每种设备都各需要1个,考虑到性价比问题,要求所挑选出来的n件设备,要使得B/P最大.其中B为这n件设备的带宽的最小值,P为这n件设备的总价.题解:方法一:暴力枚举.枚举每个bandwidth,然后从剩…

/*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…

看题传送门:http://poj.org/problem?id=1018 题目大意: 某公司要建立一套通信系统,该通信系统需要n种设备,而每种设备分别可以有m个厂家提供生产,而每个厂家生产的同种设备都会存在两个方面的差别:带宽bandwidths 和 价格prices. 现在每种设备都各需要1个,考虑到性价比问题,要求所挑选出来的n件设备,要使得B/P最大. 其中B为这n件设备的带宽的最小值,P为这n件设备的总价. 思路: 贪心+枚举 要使得B/P最大,则B应该尽量大,而P尽量小. 可以按照价格…

题目链接:http://poj.org/problem?id=1018 题目大意:有n种通讯设备,每种有mi个制造商,bi.pi分别是带宽和价格.在每种设备中选一个制造商让最小带宽B与总价格P的比值B/P最大. 解法是枚举最小带宽B,每种设备在带宽大于B的制造商中找价格最小的,最后取比值最大的. 详见代码: #include<cstdio> #include<cmath> #include<cstring> #include<algorithm> using…

动态规划 动态规划 容易: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 不易: , , , , , , , , , , , , , , , , , , , , , , , , 推荐: , , , , , , , , , , , , , , , , , , , , , , , , Jury Compromise False co…

此文转载别人,希望自己能够做完这些题目! 1.POJ动态规划题目列表 容易:1018, 1050, 1083, 1088, 1125, 1143, 1157, 1163, 1178, 1179, 1189, 1208, 1276,1322, 1414, 1456, 1458, 1609, 1644, 1664, 1690, 1699, 1740(博弈),1742, 1887, 1926(马尔科夫矩阵,求平衡), 1936, 1952, 1953, 1958, 1959, 1962, 1975,…

Information Disturbing Problem Description   In the battlefield , an effective way to defeat enemies is to break their communication system.The information department told you that there are n enemy soldiers and their network which have n-1 communica…

Information Disturbing Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 131072/65536 K (Java/Others)Total Submission(s): 3205    Accepted Submission(s): 1137 Problem Description In the battlefield , an effective way to defeat enemies is to bre…

A POJ 1018 Communication System B POJ 1050 To the Max C POJ 1083 Moving Tables D POJ 1125 Stockbroker Grapevine E POJ 1143 Number Game F POJ 1157 LITTLE SHOP OF FLOWERS G POJ 1163 The Triangle H POJ 1178 Camelot I POJ 1179 Polygon J POJ 1189 钉子和小球 K…

Communication System Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 25653   Accepted: 9147 Description We have received an order from Pizoor Communications Inc. for a special communication system. The system consists of several devices.…

题目链接:https://vjudge.net/contest/216347#problem/C   Alice gets two sequences A and B. A easy problem comes. How many pair of sequence A' and sequence B' are same. For example, {1,2} and {1,2} are same. {1,2,4} and {1,4,2} are not same. A' is a subsequ…

Communication System Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 28273   Accepted: 10074 Description We have received an order from Pizoor Communications Inc. for a special communication system. The system consists of several devices…

动态规划 动态规划 容易: 1018, 1050, 1083, 1088, 1125, 1143, 1157, 1163, 1178, 1179, 1189, 1208, 1276, 1322, 1414, 1456, 1458, 1609, 1644, 1664, 1690, 1699, 1740, 1742, 1887, 1926, 1936, 1952, 1953, 1958, 1959, 1962, 1975, 1989, 2018, 2029, , 2063, 2081, 2082,…