题解 | The Biggest Water Problem
The Biggest Water Problem
https://www.nowcoder.com/practice/435aa556e093463891f6da7d322140a4
def f(n):
sum = 0
for i in str(n):
sum += int(i)
if 0 < n < 10:
return n
return f(sum)
n = int(input())
print(f(n))
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