HDU2079选课时间(母函数)

母函数的简单应用http://acm.hdu.edu.cn/showproblem.php?pid=2079

介绍见另一篇随笔HDU1028Ignatius and the Princess III(母函数)

#include<stdio.h>



int main()
{
    int T;
    while(~scanf("%d", &T))while(T--)
    {
        int c1[41]={0},c2[41]={0};
        int num,val;
        int i,n,k;
        scanf("%d%d", &n, &k);
        for(i = 1; i<=k;i++)
        {
            scanf("%d%d",&val, &num);
            if(i ==1)
            {
                for(int j = 0; j<=num && j*val<=n ;j++)
                {
                    c1[j*val] = 1;
                    c2[j*val] = 0;
                }
            }
            else
            {
                for(int j = 0;j <= n;j ++ )
                {
                    for(int t = 0;t*val +j <=n && t<=num; t++)
                    {
                        c2[j+t*val] += c1[j];
                    }
                }
                for(j =0;j<=n;j++)
                {
                    c1[j]=c2[j];
                    c2[j]=0;
                }
            }
        }
        printf("%d\n", c1[n]);
    }
    return 0;
}