题目链接

The Biggest Water Problem

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;
}