HDU 1171 Big Event in HDU

#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
using namespace std;

const int maxn=55;
int V[maxn],C[maxn];
int dp[maxn*maxn*110];

int main()
{
    int n,i,j,k,summ;
    while(~scanf("%d",&n))
    {
        if(n<=0) break;
        memset(dp,0,sizeof(dp));
        dp[0]=1;summ=0;
        for(i=1; i<=n; i++)
        {
            scanf("%d%d",&V[i],&C[i]);
            summ=summ+V[i]*C[i];
        }
        for(i=1; i<=n; i++)
            for(j=1; j<=C[i]; j++)
                for(k=summ; k>=0; k--)
                    if(dp[k]==1)
                        dp[k+V[i]]=1;
        for(i=summ/2; i>=0; i--)
            if(dp[i])
                break;
        printf("%d %d\n",max(i,summ-i),min(i,summ-i));
    }
    return 0;
}