设为首页 加入收藏

TOP

杭电 2602 Bone Collector(背包问题 )
2015-07-20 17:53:05 来源: 作者: 【 】 浏览:2
Tags:杭电 2602 Bone Collector 背包 问题

Bone Collector

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 29109 Accepted Submission(s): 11898

Problem Description Many years ago , in Teddy’s hometown there was a man who was called “Bone Collector”. This man like to collect varies of bones , such as dog’s , cow’s , also he went to the grave …
The bone collector had a big bag with a volume of V ,and along his trip of collecting there are a lot of bones , obviously , different bone has different value and different volume, now given the each bone’s value along his trip , can you calculate out the maximum of the total value the bone collector can get ?
\


Input The first line contain a integer T , the number of cases.
Followed by T cases , each case three lines , the first line contain two integer N , V, (N <= 1000 , V <= 1000 )representing the number of bones and the volume of his bag. And the second line contain N integers representing the value of each bone. The third line contain N integers representing the volume of each bone.
Output One integer per line representing the maximum of the total value (this number will be less than 2 31).
Sample Input
1
5 10
1 2 3 4 5
5 4 3 2 1

Sample Output
14

Author Teddy
Source HDU 1st “Vegetable-Birds Cup” Programming Open Contest 这是 01 背包问题 01 背包问题用到了递推的思想,并且用到了分治 将大问题转化为能够容易解决的,小问题,从小问题来得到答案的思想 大致思路如下: c[i-1][v]表示前i-1件物品恰放入一个质量为m的背包可以取到最大价值,若只考虑第i件物品的话,那么有两种情况,就是放,与不放,要是放的话,那么问题就转化为“将前n-1件物品放入剩下的容量为m-w[i]的背包中,此时获得的最大价值就是c[i-1][m-w[i]]再加上最后放进去的第i件的物品所获得价值p[i];要是不放的话,问题就变成:”将前n-1件物品放入容量为j的背包中,此时获得的最大价值就是c[i-1][m];然后题上一般有物品的数量,及相应的价值,通过两个for循环就好了;最后的最大价值就是c[n][m]; 代码如下:
#include
  
   
#include
   
     int dp[1010][1010],val[1010],vol[1010]; int main() { int n,i,j,v,t; scanf("%d",&t); while(t--) { scanf("%d%d",&n,&v); for(i=1;i<=n;i++) scanf("%d",&val[i]); for(j=1;j<=n;j++) scanf("%d",&vol[j]); memset(dp,0,sizeof(dp)); for(i=1;i<=n;i++) for(j=0;j<=v;j++)//题上有个陷阱,就是将没有体积但是有价值的 骨头考虑了进去 { if(vol[i]<=j&&dp[i-1][j]
     
     
】【打印繁体】【投稿】【收藏】 【推荐】【举报】【评论】 【关闭】 【返回顶部
分享到: 
上一篇UVA - 11388 GCD LCM 下一篇poj 3225 区间(区间的交并补操作)

评论

帐  号: 密码: (新用户注册)
验 证 码:
表  情:
内  容: