[C++]백준 1110번:더하기 사이클

https://www.acmicpc.net/problem/1110

#include <iostream>

using namespace std;

int main() {

int N;

int A[2] = {0};

do{

cin >> N;

} while (0 > N || N > 99);

A[0] = N / 10;

A[1] = N % 10;

int sum_new, cnt;

sum_new = cnt = 0;

do{

int sum = A[0] + A[1];

sum_new = (10 * A[1]) + (sum % 10);

cnt++;

A[0] = sum_new / 10;

A[1] = sum_new % 10;

} while (sum_new != N);

cout << cnt << endl;

}