经典的字符串hash

#define SHIFT 4
#define HASH_SIZE 211
int hash( char * key)
{
	int tmp = 0;
	int i =0;
	while(key[i] != '\0')
	{
		tmp = ( tmp << SHIFT + key[i] ) % HASH_SIZE;
		++i;
	}
	return tmp;
}
/* 各位不同 ， abc != bca*/