题解 | The Biggest Water Problem
The Biggest Water Problem
https://www.nowcoder.com/practice/435aa556e093463891f6da7d322140a4
#include <stdio.h>
int fun(int n)
{
int sum = 0;
while (n)
{
sum += n % 10;
n /= 10;
}
if (sum < 10)
return sum;
return fun(fun(sum));
}
int main()
{
int n,sum = 0;
scanf("%d", &n);
printf("%d", fun(n));
return 0;
}
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