HDU1171--Big Event in HDU(多重背包)

Big Event in HDU

 
Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 1139 Accepted Submission(s): 444

Problem Description

Nowadays, we all know that Computer College is the biggest
department in HDU. But, maybe you don‘t know that Computer College had
ever been split into Computer College and Software College in 2002.
The
splitting is absolutely a big event in HDU! At the same time, it is a
trouble thing too. All facilities must go halves. First, all facilities
are assessed, and two facilities are thought to be same if they have the
same value. It is assumed that there is N (0<N<1000) kinds of
facilities (different value, different kinds).


Input

Input contains multiple test cases. Each test case starts with a
number N (0 < N <= 50 -- the total number of different
facilities). The next N lines contain an integer V (0<V<=50
--value of facility) and an integer M (0<M<=100 --corresponding
number of the facilities) each. You can assume that all V are different.
A test case starting with a negative integer terminates input and this test case is not to be processed.


Output

For each case, print one line containing two integers A and B
which denote the value of Computer College and Software College will get
respectively. A and B should be as equal as possible. At the same time,
you should guarantee that A is not less than B.


Sample Input

2
10 1
20 1
3
10 1
20 2
30 1
-1

Sample Output

20 10
40 40

Author

lcy

这是一个多重背包的题目(将物品的原价值即为放入背包中物品的价值与花费,因为当不超过背包容量且价值之和最大时,即为不超过背包容量且花费之和最大(花费最接近背包容量),即为这些物品的原价值之和最接近背包容量。此处将物品总价值的一半看为背包容量即可。

这里有一个我见过的最诡异的八阿哥。。。汗。。。

这道题是以负数作为输入的结束标志的,而不只局限于-1, 被惯性思维坑了。。。。

代码:

 1 #include<iostream>
 2 #include<cstdio>
 3 #include<cstring>
 4 #include<algorithm>
 5 #include<cmath>
 6 using namespace std;
 7 const int MAXN=250010;
 8 const int inf=99999999;
 9 int v[MAXN];
10 int dp[MAXN];
11 int num[55];
12 int main()
13 {
14     //freopen("data.in","r",stdin);
15     std::ios::sync_with_stdio(false);
16     std::cin.tie(0);
17     int n;
18     int sum;
19     int cc;
20     while(cin>>n&&n>=0){
21         sum=0;
22         memset(dp,0,sizeof(dp));
23         for(int i=0;i<n;i++){
24             cin>>v[i]>>num[i];
25             sum+=(v[i]*num[i]);
26         }
27         cc=sum/2;
28         for(int i=0;i<n;i++){
29             for(int k=0;k<num[i];k++){
30                 for(int j=cc;j>=v[i];j--){
31                         dp[j]=max(dp[j],dp[j-v[i]]+v[i]);
32                 }
33             }
34         }
35         cout<<sum-dp[cc]<<" "<<dp[cc]<<endl;
36     }
37 }
时间: 2024-08-02 06:57:22

HDU1171--Big Event in HDU(多重背包)的相关文章

HDU-1171 Big Event in HDU (多重背包)

Problem Description Nowadays, we all know that Computer College is the biggest department in HDU. But, maybe you don't know that Computer College had ever been split into Computer College and Software College in 2002.The splitting is absolutely a big

Big Event in HDU 多重背包

B - Big Event in HDU Nowadays, we all know that Computer College is the biggest department in HDU. But, maybe you don't know that Computer College had ever been split into Computer College and Software College in 2002. The splitting is absolutely a b

HDU 1171 Big Event in HDU (多重背包变形)

Big Event in HDU Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 27961    Accepted Submission(s): 9847 Problem Description Nowadays, we all know that Computer College is the biggest department

hdu1171 Big Event in HDU 01-背包

转载请注明出处:http://blog.csdn.net/u012860063 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1171 Problem Description Nowadays, we all know that Computer College is the biggest department in HDU. But, maybe you don't know that Computer College had ever bee

HDU1171 Big Event in HDU 【母函数】

Big Event in HDU Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 22835    Accepted Submission(s): 8018 Problem Description Nowadays, we all know that Computer College is the biggest department

(hdu step 3.3.1)Big Event in HDU(01背包:N件物品放在容量为V的背包中,第i件物品的费用是c[i],价值是w[i]。问所能获取的最大价值)

Big Event in HDU Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 854 Accepted Submission(s): 345 Problem Description Nowadays, we all know that Computer College is the biggest department in HDU.

HUD 1171 Big Event in HDU(01背包)

Big Event in HDU Problem Description Nowadays, we all know that Computer College is the biggest department in HDU. But, maybe you don't know that Computer College had ever been split into Computer College and Software College in 2002.The splitting is

HDU 1171 Big Event in HDU(01背包)

Big Event in HDU Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 31928    Accepted Submission(s): 11169 Problem Description Nowadays, we all know that Computer College is the biggest departmen

HDU 1171 Big Event in HDU(01背包)

题目地址:HDU 1171 还是水题..普通的01背包.注意数组要开大点啊.... 代码如下: #include <iostream> #include <cstdio> #include <string> #include <cstring> #include <stdlib.h> #include <math.h> #include <ctype.h> #include <queue> #include &

hdu 1171 Big Event in HDU(背包DP)

题意: 杭电搬迁,有N种设备,每种设备有个价值V,数量M,要求将这些设备平分,使得平分后两边的总价值尽可能地相等. 输出两边各自的总价值. 思路: 背包DP后,P=所有的总价值/2,然后从P开始往两边找到第一个满足的价值. 可以降维,但是要注意for循环的顺序. 看代码. 代码: int v[55], m[55]; bool dp[250005]; int main(){ int n; while(scanf("%d",&n)!=EOF && n>=0){