【题解】hdu1171 01背包变形

题目链接

转化为01背包，将背包上限定为sum/2

#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
int a[],dp[];
int main()
{
    //freopen("in.txt","r",stdin);
    int n,sum,i,j,k,v,m;
    while(scanf("%d",&n)&&n>)
    {
        k=;
        sum=;
        memset(dp,,sizeof(dp));
        for(i=;i<=n;i++)
        {
            scanf("%d%d",&v,&m);
            while(m--)//转化成01背包 
            {
                a[++k]=v;
                sum+=v;
            }
        }
        for(i=;i<=k;i++)
        for(j=sum/;j>=a[i];j--)
        dp[j]=max(dp[j],dp[j-a[i]]+a[i]);
        printf("%d %d\n",sum-dp[sum/],dp[sum/]);
    }
    return ;
}