package 分支限界法; import java.util.LinkedList; import java.util.Scanner; /*01背包问题*/ public class ZOPackage { /* * 主方法 */ public static void main(String[] args) { //输入数据 System.out.println("请输入背包的容量w和物品的个数n"); Scanner in = new Scanner(System.in); in

一.什么是01背包 01背包是在M件物品取出若干件放在空间为W的背包里,每件物品的体积为W1,W2至Wn,与之相对应的价值为P1,P2至Pn.01背包是背包问题中最简单的问题.01背包的约束条件是给定几种物品,每种物品有且只有一个,并且有权值和体积两个属性.在01背包问题中,因为每种物品只有一个,对于每个物品只需要考虑选与不选两种情况.如果不选择将其放入背包中,则不需要处理.如果选择将其放入背包中,由于不清楚之前放入的物品占据了多大的空间,需要枚举将这个物品放入背包后可能占据背包空间的所有情况.

算法提高 01背包 时间限制:1.0s 内存限制:256.0MB 问题描述 给定N个物品,每个物品有一个重量W和一个价值V.你有一个能装M重量的背包.问怎么装使得所装价值最大.每个物品只有一个. 输入格式 输入的第一行包含两个整数n, m,分别表示物品的个数和背包能装重量. 以后N行每行两个数Wi和Vi,表示物品的重量和价值 输出格式 输出1行,包含一个整数,表示最大价值. 样例输入 3 5 2 3 3 5 4 7 样例输出 8 数据规模和约定 1<=N<=200,M<=5000. im

问题描述: 0-1背包问题,部分背包问题(课本P229)实验要求: (1)实现0-1背包的动态规划算法求解 (2)实现部分背包的贪心算法求解 0-1背包问题代码: public static void main(String[] args){ //获取物品个数,每个物品的重量和价值,以及背包容量 Scanner in1 = new Scanner(System.in); System.out.println("请输入物品个数和背包容量:"); int num_goods = in1.n

In Action Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5472    Accepted Submission(s): 1843 Problem Description Since 1945, when the first nuclear bomb was exploded by the Manhattan Project t

http://acm.hdu.edu.cn/showproblem.php?pid=1864 New~ 欢迎“热爱编程”的高考少年——报考杭州电子科技大学计算机学院关于2015年杭电ACM暑期集训队的选拔 最大报销额 Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 18562    Accepted Submission(s): 5459

http://acm.hdu.edu.cn/showproblem.php?pid=2955 如果认为:1-P是背包的容量,n是物品的个数,sum是所有物品的总价值,条件就是装入背包的物品的体积和不能超过背包的容量1-P. 在这个条件下,让装入背包的物品的总价值,也就是bag[i].[v]的和最大 bag.v是每一件物品的价值,bag.p是每件物品的体积 像上面这样想是行不通的.下面有解释 这道题麻烦的是概率这东西没法用个循环表示出来,根据我以往的经验,指望着把给出的测试数据乘上一百或者一万这种

Bone Collector II Time Limit: 5000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4178    Accepted Submission(s): 2174 Problem Description The title of this problem is familiar,isn't it?yeah,if you had took pa

Robberies Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 16565 Accepted Submission(s): 6087 Problem Description The aspiring Roy the Robber has seen a lot of American movies, and knows that the b

In Action Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4720 Accepted Submission(s): 1553 Problem Description Since 1945, when the first nuclear bomb was exploded by the Manhattan Project team i

饭卡 Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 16453    Accepted Submission(s): 5721 Problem Description 电子科大本部食堂的饭卡有一种很诡异的设计,即在购买之前判断余额.如果购买一个商品之前,卡上的剩余金额大于或等于5元,就一定可以购买成功(即使购买后卡上余额为负),否则无法

题意分析:0-1背包变形  递推公式:dp[i] = max(dp[i], 1-(1-dp[i-C])*(1-p)) /* I NEED A OFFER! Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 17860 Accepted Submission(s): 7152 Problem Description Speakless很早就想出国

/*Robberies Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 13854 Accepted Submission(s): 5111 Problem Description The aspiring Roy the Robber has seen a lot of American movies, and knows that the

题目链接: 题目 In Action Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) 问题描述 Since 1945, when the first nuclear bomb was exploded by the Manhattan Project team in the US, the number of nuclear weapons have soared across th

http://acm.hdu.edu.cn/showproblem.php?pid=2639 题目大意是,往背包里赛骨头,求第K优解,在普通01背包的基础上,增加一维空间,那么F[i,v,k]可以理解为前i个物品,放入容量v的背包时,第K优解的值.时间复杂度为O(NVK). Talk is cheap. 看代码吧. import java.util.Scanner; public class BoneCollector { public static void main(String[] sur

Bone Collector Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 32768/32768K (Java/Other) Total Submission(s) : 21   Accepted Submission(s) : 6 Problem Description Many years ago , in Teddy’s hometown there was a man who was called “Bone Collec

Proud Merchants Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 12   Accepted Submission(s) : 5 Problem Description Recently, iSea went to an ancient country. For such a long time, it was the mo

In Action Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4764    Accepted Submission(s): 1569 Problem Description Since 1945, when the first nuclear bomb was exploded by the Manhattan Project t

Bone Collector Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 28365    Accepted Submission(s): 11562 Problem Description Many years ago , in Teddy's hometown there was a man who was called "Bo

I NEED A OFFER! Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 16705    Accepted Submission(s): 6660 Problem Description Speakless非常早就想出国,如今他已经考完了全部须要的考试,准备了全部要准备的材料,于是,便须要去申请学校了.要申请国外的不论什么大学,

In Action Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5220    Accepted Submission(s): 1745 Problem Description Since 1945, when the first nuclear bomb was exploded by the Manhattan Project t