废物是我
The Biggest Water Problem
https://www.nowcoder.com/practice/435aa556e093463891f6da7d322140a4
#include<stdio.h>//c语言菜鸟，可能是递归？
int jia(long int n)
{
long sum=0;
while(n)
{
sum+=n%10;
n/=10;
}
return sum;
}
void shuhe(long int n)
{
if(n<=9) printf("%ld",n);
else
{
shuhe(jia(n));
}
}
int main()
{
long int n;
scanf("%ld",&n);
shuhe(n);
}
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