HDOJ题目2660 Accepted Necklace（二维01背包）



Accepted Necklace

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 2702    Accepted Submission(s): 1068

Problem Description

I have N precious stones, and plan to use K of them to make a necklace for my mother, but she won't accept a necklace which is too heavy. Given the value and the weight of each precious stone, please help me find out the most valuable necklace my mother will accept.

 

Input

The first line of input is the number of cases. 
For each case, the first line contains two integers N (N <= 20), the total number of stones, and K (K <= N), the exact number of stones to make a necklace. 
Then N lines follow, each containing two integers: a (a<=1000), representing the value of each precious stone, and b (b<=1000), its weight. 
The last line of each case contains an integer W, the maximum weight my mother will accept, W <= 1000. 

 

Output

For each case, output the highest possible value of the necklace.

 

Sample Input

1 2 1 1 1 1 1 3 

 

Sample Output

1 

 

Source

HDU男生专场公开赛——赶在女生之前先过节（From WHU）

 

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ac代码

#include<stdio.h>#include<string.h>#define max(a,b) (a>b?a:b)int dp[1010][1010];int main(){int t;scanf("%d",&t);while(t--){int n,k,w[50],v[50],ii,i,j,m;memset(dp,0,sizeof(dp));scanf("%d%d",&n,&k);for(i=0;i<n;i++){scanf("%d%d",&v[i],&w[i]);}scanf("%d",&m);for(i=0;i<n;i++){for(j=m;j>=w[i];j--){for(ii=1;ii<=k;ii++){dp[j][ii]=max(dp[j][ii],dp[j-w[i]][ii-1]+v[i]);}}}printf("%d\n",dp[m][k]);}}