题解
The Biggest Water Problem
http://www.nowcoder.com/questionTerminal/435aa556e093463891f6da7d322140a4
include<bits/stdc++.h>
using namespace std;
int work(int n)
{
if(n<10)
return n;
else{
int t=0;
while(n>0){
t+=n%10;
n=n/10;
}
return work(t);
}
}
int main()
{
int n;
cin>>n;
cout<<A(n);
}
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