hdu1171big events in hdu【多重背包模板】【01背包】

水题 居然遇到杭电oj挂了==这是都在备战区域赛？？？

/************
hdu1711
2015.10.16
************/
#include <iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int dp[50005];
int value[60],num[60];
int n,total,sum;
void zero(int cost,int weight)
{
    for(int i=total;i>=cost;i--) dp[i]=max(dp[i],dp[i-cost]+weight);
}
void complete(int cost,int weight)
{
    for(int i=cost;i<=cost;i++) dp[i]=max(dp[i],dp[i-cost]+weight);
}
void multi(int cost,int weight,int cnt)
{
    if(total<=cnt*cost)
    {
        complete(cost,weight);
        return;
    }
    int k=1;
    while(k<=cnt)
    {
        zero(k*cnt,k*weight);
        cnt=cnt-k;
        k=2*k;
    }
    zero(cnt*cost,cnt*weight);
}
int main()
{
    while(~scanf("%d",&n))
    {
        if(n==-1) break;
        total=0;
        sum=0;
        for(int i=0;i<n;i++) {
            scanf("%d%d",&value[i],&num[i]);
            total+=(value[i]*num[i]);
        }
        printf("%d \n",total);
        sum=total;
        total/=2;
        memset(dp,0,sizeof(dp));
        for(int i=0;i<n;i++)
        {
            multi(value[i],value[i],num[i]);
        }
        printf("%d %d\n",sum-dp[total],dp[total]);
    }
    return 0;
}

还有一种01背包的解法 感觉更适合这个题 

之前WA了好多次 脑残错误都改过来了 依旧不对 重新写一遍果然好使

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int n,tot,a,b,sum;
int dp[255000],val[600];
int main()
{
    while(~scanf("%d",&n),n>0)
    {
        sum=0;
        tot=0;
        for(int i=0;i<n;i++)
        {
            scanf("%d%d",&a,&b);
            while(b--)
            {
                val[tot++]=a;
                sum+=a;
            }
        }
        memset(dp,0,sizeof(dp));
        for(int i=0;i<tot;i++)
        {
            for(int j=sum/2;j>=val[i];j--)
            {
                dp[j]=max(dp[j],dp[j-val[i]]+val[i]);
            }
        }
        printf("%d %d\n",sum-dp[sum/2],dp[sum/2]);
    }
    return 0;
}