2.9 The Biggest Water Problem *
题目链接
题目思路
无脑暴力递归
代码实现
#include<bits/stdc++.h>
using namespace std;
int main()
{
int n;
cin>>n;
while(n>=10)
{
int sum=0;
while(n)
{
sum+=(n%10);
n/=10;
}
n=sum;
}
cout<<n<<endl;
}