BKDRHash

unsigned int BKDRHash(unsigned char *card, int len)
{
    unsigned int seed = 131313; //也可以是 31 131 1313
    unsigned int hash = 0;

    len += 1;
    while (--len)
    {
        hash = hash * seed + card[len-1];
    }

    return hash % 45053;        //取一个大素数, 落在了0~45052内, 哈希表长度 45053
}