[알고리즘] 콜라츠 수열 만들기 Java

 

import java.util.ArrayList;
import java.util.List;

class Solution {
    public int[] solution(int n) {
        List<Integer> answer = new ArrayList<>();
        answer.add(n);
        while (n > 1) {
          n = n % 2 == 0 ? n / 2 : 3 * n + 1;
          answer.add(n);
        }

        return answer.stream().mapToInt(Integer::valueOf).toArray();
    }
}