题目
2021浙江春晚，郭冬临到底喝了多少水？
2个瓶盖 换1瓶， 4个空瓶 换1瓶，请问5，能喝到多少汽水？
解答
写了2种
all_water_num = 0 # 喝水总数
empty_bottle = 0 # 空瓶总数
capsule = 0 # 瓶盖
def exchange(num):
global all_water_num
global empty_bottle
global capsule
# 空瓶和瓶盖需要累加
empty_bottle += num
capsule += num
all_water_num += num
if empty_bottle < 4 and capsule < 2: return all_water_num
water_num = 0 # 能兑换的数量
water_num += empty_bottle // 4
water_num += capsule // 2
# 更新空瓶和瓶盖
empty_bottle = empty_bottle % 4
capsule = capsule % 2
return exchange(water_num)
def run2(num):
def exchange2(empty_bottle, capsule, all_water_num):
if empty_bottle < 4 and capsule < 2: return all_water_num
water_num = 0
water_num += empty_bottle // 4
water_num += capsule // 2
empty_bottle = empty_bottle % 4
capsule = capsule % 2
all_water_num += water_num
empty_bottle += water_num
capsule += water_num
return exchange2(empty_bottle, capsule, all_water_num)
return exchange2(num, num, num)
