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