hdu 1171 Big Event in HDU

#include <iostream>
#include <cstdio>
#include <cstring>
#include <cstring>
using namespace std;

int c1[100000],c2[100000];
int a[55],num[55];

int main(){
    int n;
    while(scanf("%d",&n),n > 0){
        //然而这里并不能写成n != -1...
        int sum = 0;
        int i,j,k;
        memset(c1,0,sizeof(c1));
        memset(c2,0,sizeof(c2));
        for(i = 0; i < n; i++){
            scanf("%d%d",&a[i],&num[i]);
            sum += a[i]*num[i];
        }
        int mid = sum/2;
        for(i = 0; i <= num[0]; i++)
            c1[i*a[0]] = a[0];
        for(i = 1; i < n; i++){
            for(j = 0; j <= mid; j++)
                for(k = 0; k <= num[i] && k*a[i]+j <= mid;k++)
                    c2[k*a[i]+j] += c1[j];
            for(j = 0; j <= mid; j++){
                c1[j] = c2[j];
                c2[j] = 0;
            }
        }
        for(i = mid; i >= 0; i--)
            if(c1[i])
                break;
        printf("%d %d\n",sum-i,i);
    }
    return 0;
}