[USACO09DEC]视频游戏的麻烦Video Game Troubles(DP)
https://www.luogu.org/problem/P2967
https://ac.nowcoder.com/acm/contest/1077/B
题目描述
The cows disagree, though, on which is the best game console. One cow wanted to buy the Xbox 360 to play Halo 3; another wanted to buy the Nintendo Wii to play Super Smash Brothers Brawl; a third wanted to play Metal Gear Solid 4 on the PlayStation 3. FJ wants to purchase the set of game consoles (no more than one each) and games (no more than one each -- and within the constraints of a given budget) that helps his cows produce the most milk and thus nourish the most children.
FJ researched N (1 <= N <= 50) consoles, each with a console price Pi (1 <= Pi <= 1000) and a number of console-specific games Gi (1 <= Gi <= 10). A cow must, of course, own a console before she can buy any game that is specific to that console. Each individual game has a game price GPj (1 <= GPj price <= 100) and a production value (1 <= PVj <= 1,000,000), which indicates how much milk a cow will produce after playing the game. Lastly, Farmer John has a budget V (1 <= V <= 100,000) which is the maximum amount of money he can spend. Help him maximize the sum of the production values of the games he buys.
Consider one dataset with N=3 consoles and a V=$800 budget. The first console costs $300 and has 2 games with cost $30 and $25 and production values as shown:
Game # Cost Production Value
1 $30 50
2 $25 80 The second console costs $600 and has only 1 game:
Game # Cost Production Value
1 $50 130 The third console costs $400 and has 3 games:
Game # Cost Production Value
1 $40 70
2 $30 40
3 $35 60 Farmer John should buy consoles 1 and 3, game 2 for console 1, and games 1 and 3 for console 3 to maximize his expected production at 210:
Production Value
Budget: $800
Console 1 -$300
Game 2 -$25 80
Console 3 -$400
Game 1 -$40 70
Game 3 -$35 60
-------------------------------------------
Total: 0 (>= 0) 210
题意翻译
农夫约翰的奶牛们打游戏上瘾了!本来约翰是想要按照调教兽的做法拿她们去电击戒瘾的,可后来他发现奶牛们玩游戏之后比原先产更多的奶。很明显,这是因为满足的牛会产更多的奶。
但是,奶牛们因何者为最好的游戏主机而吵得不可开交。约翰想要在给定的预算内购入一些游戏平台和一些游戏,使他的奶牛们生产最多的奶牛以养育最多的小牛。
约翰考察了 N 种游戏主机,第 i 种主机的价格是 Pi,该主机有 Gi 个独占游戏。很明显,奶牛必须先买进一种游戏主机,才能买进在这种主机上运行的游戏。在每种主机中,游戏 j 的价格为 GPj,
每头奶牛在玩了该游戏后的牛奶产量为PVj。
农夫约翰的预算为 V。请帮助他确定应该买什么游戏主机和游戏,使得他能够获得的产出值的和最大。
样例说明 1
假设 现在有 N=3 种主机,预算为V=800。
第一种主机的售价为 300,并且有两款游戏:
游戏编号 | GPj | PVj |
---|---|---|
1 | $30 | 50 |
2 | $25 | 80 |
第二种主机的售价为 600,并且只有一款游戏:
游戏编号 | GPj | PVj |
---|---|---|
1 | $50 | 130 |
第二种主机的售价为 400,并且有三款游戏:
游戏编号 | GPj | PVj |
---|---|---|
1 | $40 | 70 |
2 | $30 | 40 |
3 | $35 | 60 |
理想方案:
产量
预算: $800
主机 1 -$300
游戏 2 -$25 80
主机 3 -$400
游戏 1 -$40 70
游戏 3 -$35 60
-------------------------------------------
总和: 0 (≥ 0) 210
输入描述:
* Line 1: Two space-separated integers: N and V
* Lines 2..N+1: Line i+1 describes the price of and the games ?available for console i; it contains: Pi, Gi, and Gi pairs of space-separated integers GPj, PVj
输出描述:
* Line 1: The maximum production value that Farmer John can get with his budget.
示例1
输入
输出
#include <stdio.h>
#include <string.h>
#include <iostream>
#include <string>
#include <math.h>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <math.h>
const int INF=0x3f3f3f3f;
typedef long long LL;
const int mod=1e9+;
const double PI=acos(-);
const int maxn=;
using namespace std;
//ios::sync_with_stdio(false);
// cin.tie(NULL); int n,v;
int DP[][]; int main()
{
scanf("%d %d",&n,&v);
for(int i=;i<=n;i++)
{
int cost,num;
scanf("%d %d",&cost,&num);
for(int j=cost;j<=v;j++)
DP[i][j]=DP[i-][j-cost];//买了i个平台剩下j元 (j-cost)为买其他剩的钱
for(int k=;k<=num;k++)//遍历每种游戏
{
int a,b;
scanf("%d %d",&a,&b);
for(int j=v;j>=cost+a;j--)
DP[i][j]=max(DP[i][j],DP[i][j-a]+b);//一维01背包问题
}
for(int j=;j<=v;j++)
DP[i][j]=max(DP[i][j],DP[i-][j]);//重新判断一次,判断这个平台到底是买还是不买更值
}
printf("%d",DP[n][v]);
return ;
}
一些题解:
https://www.cnblogs.com/hkpls/p/9908869.html
https://ac.nowcoder.com/acm/contest/view-submission?submissionId=41148893
https://www.cnblogs.com/Xxzxx/p/11336946.html
https://www.cnblogs.com/pile8852/p/9280310.html
https://blog.csdn.net/weixin_33835690/article/details/93431150
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