题解 | #汽水瓶#

# def getChangeColas(n):
#     drinks = n // 3
#     global count
#     count += drinks
#     reserve = n % 3
#     if drinks + reserve >= 3:
#         getChangeColas(drinks + reserve)
#     else:
#         count += 1

# while 1:
#     num = int(input())
#     if not num:
#         break
#     count = 0
#     getChangeColas(num)
#     print(count)

while 1:
    num = int(input())
    if not num:
        break
    print(num // 2)

由递归后引发的思考，有的题就是让你逻辑兜一大圈，实际上tmd。。。每次拿两个空瓶去借一个喝完还回去是刚好不留空瓶的，实际能喝到的数量就是你两个两个空瓶去喝，实际上就是两个空瓶等于一瓶饮料的问题，直接除以2就完了。。。我🤮啦