使用固定长度的静态数组可以避免发重复牌。 把刚发的牌与之前已经发出的牌一一进行比较(把已经发 出的牌放到静态数组中），如果没有相同牌，则发 牌；如果有相同牌，则不发牌-Static array using a fixed-length hair to avoid duplication of cards. The newly issued licenses have been issued with the cards one by one before the comparison