多多看DVD(加强版)_DP

本文探讨了在有限时间和特定数量限制下选择观看DVD的最大价值组合问题。通过动态规划算法解决了一个具体的实例,并提供了实现代码。

多多看DVD(加强版)

(watchdvd.pas/c/cpp)

来源:本人原创

【问题描述】

    多多进幼儿园了,今天报名了。只有今晚可以好好放松一下了(以后上了学后会很忙)。她的叔叔决定给他买一些动画片DVD晚上看。可是爷爷规定他们只能在一定的时间段L看完。(因为叔叔还要搞NOIP不能太早陪多多看碟,而多多每天很早就困了所以只能在一定的时间段里看碟)。多多列出一张表要叔叔给她买N张DVD碟,大多都是多多爱看的动画片(福音战士,机器猫,火影忍者,樱桃小丸子……)。这N张碟编号为(1,2,3……N)。多多给每张碟都打了分Mi(Mi>0),打分越高的碟说明多多越爱看。每张碟有播放的时间Ti。多多想在今晚爷爷规定的时间里看的碟总分最高。(必须把要看的碟看完,也就是说一张碟不能只看一半)。显然叔叔在买碟是没必要把N张全买了,只要买要看的就OK了,这样节省资金啊。而且多多让叔叔惯的特别任性只要他看到有几张就一定会看完。

可是出现了一个奇怪的问题,买碟的地方只买给顾客M(M<N)张碟,不会多也不会少。这可让多多叔叔为难了。怎么可以在N张碟中只买M张而且在规定时间看完,而且使总价值最高呢?

聪明的你帮帮多多的叔叔吧。

【输入说明】(watchdvd.in)

    输入文件有三行

    第一行:两个数空格隔开的正整数,N,M,L(分别表示叔叔给多多买的碟的数量,商店要买给叔叔的碟的数量,爷爷规定的看碟的时间段)。

    第二行到第N行,每行两个数:T,M,给出多多列表中DVD碟的信息。

【输出说明】(watchdvd.out)

    单独输出一行

表示多多今晚看的碟的总分。

如果商店卖给叔叔的M张碟无法在爷爷规定的时间看完输出0;

【输入样例】

    32 10

   11 100

    12

    91

【输出样例】

    3

【数据范围】

   20%的数据   N <=20; L<=2000;

   100%的数据  N<=100 L<=2000; M <N

【时限】

1S

【提交链接】

 http://www.rqnoj.cn/

#include
#include
using namespace std;

int f[101][1001],t[101],a[101],n,m,l;

int main()
{
    int i,j,k;
    cin>>n>>m>>l;
    
    for(i=1;i<=n;i++)
    cin>>t[i]>>a[i];
    
    for(i=0;i<=m;i++)
    for(j=0;j<=l;j++)
    f[i][j]=-10000;
    
    for(i=0;i<=l;i++) 
    f[0][i]=0;
    
    for(i=1;i<=n;i++)
    for(k=l;k>=t[i];k--)
    for(j=m;j>=1;j--)
    if(f[j][k]

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09-04
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