题目链接:http://acm.uestc.edu.cn/#/problem/show/1691
解法:就是裸的多重背包,二进制优化或者直接暴力。

1,二进制优化

#include <bits/stdc++.h>
using namespace std;
const int maxn = 50010;
int n,V,w[maxn],p[maxn],c[maxn],dp[maxn];
int weight[maxn],val[maxn],cnt=0;

int main()
{
    scanf("%d %d", &n,&V);
    for(int i=1; i<=n; i++){
        scanf("%d %d %d", &w[i],&p[i],&c[i]);
        int k=1;
        while(k<c[i]){
            ++cnt;
            weight[cnt]=k*w[i],val[cnt]=k*p[i];
            c[i]-=k;
            k<<=1;
        }
        if(c[i]){
            ++cnt;
            weight[cnt]=c[i]*w[i],val[cnt]=c[i]*p[i];
        }
    }
    memset(dp,0,sizeof(dp));
    for(int i=1; i<=cnt; i++){
        for(int j=V;j>=weight[i];j--){
            dp[j]=max(dp[j],dp[j-weight[i]]+val[i]);
        }
    }
    printf("%d\n", dp[V]);
    return 0;
}

2,直接转化成01背包



#include <bits/stdc++.h> using namespace std; const int maxn = 50010; int n,V,w[maxn],p[maxn],c[maxn],dp[110][maxn]; int main() {  scanf("%d %d", &n,&V);  for(int i=1; i<=n; i++){  scanf("%d %d %d", &w[i],&p[i],&c[i]);  }  memset(dp,0,sizeof(dp));  for(int i=1; i<=n; i++){  for(int k=0; k<=c[i]; k++){  for(int j=V; j>=0; j--){  if((j-k*w[i])>=0){  dp[i][j]=max(dp[i][j],dp[i-1][j-k*w[i]]+k*p[i]);  }  else break;  }  }  }  printf("%d\n",dp[n][V]);  return 0; }