POJ 1844

#include <iostream>
#define MAXN 20
using namespace std;

int value[MAXN];
int place[MAXN];
int dp[MAXN][15000];

int main()
{
    //freopen("acm.acm","r",stdin);
    int n;
    int c;
    int i;
//    cin>>n;
//    cin>>c;
    scanf("%d",&n);
    scanf("%d",&c);
    for(i = 0; i < n; ++ i)
    {
        //cin>>place[i];
        scanf("%d",&place[i]);
    }
    for(i = 0; i < c; ++ i)
    {
        //cin>>value[i];
        scanf("%d",&value[i]);
    }
    memset(dp,0,sizeof(dp));
    for(i = 0; i < n; ++ i)
    {
        ++ dp[0][7500 + value[0]*place[i] ];
    }

    int k;
    int tem;
    int j;

    for(i = 1; i < c; ++ i)
    {
        for(j = 0; j < n; ++ j)
        {
            for(k = 15000; k >= 0; -- k)
            {    
                tem = k - (place[j]*value[i]);
                if(tem >= 0)
                {
                    dp[i][k] += dp[i-1][tem];
                }
            }
        }
    }
    //cout<<dp[c-1][7500]<<endl;
    printf("%d
",dp[c-1][7500]);
}

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