牛客华为HJ22_汽水瓶

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import sys
def w_b(a):
    result = []
    def water_bottle(a,result):
        if a==2: 
            result.append(1)
            return  
        if a==1 or a==0:
            return  
        water,bottle = a//3,a%3
        result.append(water)
        water_bottle(water+bottle,result)
        return result
    return sum(water_bottle(a,result))
    
for line in sys.stdin:
    a = line.split()
    a = int(a[0])
    if a==0: break
    else:
        result = w_b(a)
        print(result)