POJ3624 Charm Bracelet

http://poj.org/problem?id=3624

 

裸01背包

 

code:

#include <stdio.h>
#define M 13000
#define N 4000
int n, t;
int f[M];
int w[N], v[N];
int main() {
    int i, j, max;
    scanf("%d%d",&n,&t);
    for(i=0; i< n; i++)
        scanf("%d%d",&w[i],&v[i]);
    for(i=0; i<n; i++)
        for(j=t; j>=w[i]; j--)
            if(f[j]<f[j-w[i] ]+ v[i]) f[j] = f[j-w[i]] + v[i];
    max = f[0];
    for(i=t; i>0; i--) if(max<f[i]) max= f[i];
    printf("%d\n",max);
    return 0;
}