PKU 3624 Charm Bracelet

Charm Bracelet

Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 131072/65536K (Java/Other)

Total Submission(s) : 26   Accepted Submission(s) : 16

Problem Description

Bessie has gone to the mall's jewelry store and spies a charm bracelet. Of course, she'd like to fill it with the best charms possible from theN (1 ≤ N ≤ 3,402) available charms. Each charm i in the supplied list has a weightWi (1 ≤ Wi ≤ 400), a 'desirability' factorDi (1 ≤ Di ≤ 100), and can be used at most once. Bessie can only support a charm bracelet whose weight is no more thanM (1 ≤ M ≤ 12,880).

Given that weight limit as a constraint and a list of the charms with their weights and desirability rating, deduce the maximum possible sum of ratings.

Input

* Line 1: Two space-separated integers: N and M * Lines 2..N+1: Line i+1 describes charm i with two space-separated integers:Wi and Di

Output

* Line 1: A single integer that is the greatest sum of charm desirabilities that can be achieved given the weight constraints

Sample Input

    4 6
1 4
2 6
3 12
2 7

Sample Output

    23

Source

PKU

01背包入门题

#include<stdio.h>
#include<string.h>
int f[13333];
int wi[4444];
int di[4444];
int max(int a,int b)
{
    return a>b?a:b;
}
int main()
{
    int m,n;
    int i,j;
    while(scanf("%d%d",&n,&m)!=EOF)
    {
        for(i=0;i<n;i++)
            scanf("%d%d",&wi[i],&di[i]);
        memset(f,0,sizeof(f));
        for(i=0;i<n;i++)
        {
            for(j=m;j>=wi[i];j--)
            {
                f[j]=max(f[j],f[j-wi[i]]+di[i]);
            }
        }
        printf("%d\n",f[m]);
    }
    return 0;
}