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