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;
}