题解 | #Digital Roots#
Digital Roots
https://www.nowcoder.com/practice/cef727d0af33479c9fb4a9c120702414
#include<iostream>
using namespace std;
int getSum(int n)
{
int res = 0;
while(n)
{
res = res + (n % 10);
n /= 10;
}
return res;
}
int main(void)
{
int n;
while(cin >> n)
{
while(n >= 10) n = getSum(n);
cout << n << endl;
}
return 0;
}
