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