题解 | #Digital Roots#
Digital Roots
https://www.nowcoder.com/practice/cef727d0af33479c9fb4a9c120702414
#include<stdio.h>
#include<vector>
using namespace std;
int main(){
int n;
while (scanf("%d", &n) != EOF){
while (n >= 10){
vector<int>vec;
int k;
while (n != 0){
k = n % 10;
vec.push_back(k);
n = n / 10;
}
for (int i = 0; i < vec.size(); i++){
n = n + vec[i];
}
}
printf("%d\n", n);
}
}
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