题解 | #Digital Roots#
Digital Roots
https://www.nowcoder.com/practice/cef727d0af33479c9fb4a9c120702414
#include <iostream>
#include <string>
using namespace std;
int dsum(int x){
while(x>=10){
int a=0;
int k=x;
while(k>0){
a+=k%10;
k/=10;}
x=a;
}
return x;
}
int main() {
int x;
while(cin>>x){
cout<<dsum(x)<<endl;
}
}
// 64 位输出请用 printf("%lld")
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