题解 | 质数因子

import java.util.Scanner;

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

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        int a = in.nextInt();
        List<Integer> list = new ArrayList();
        getNum(a, list, 0);
        for (int i : list) {
            System.out.print(i);
            System.out.print(' ');
        }
    }

    private static void getNum(int a, List list, int t) {
        if(a == 1) {
            return ;
        }
        for (int i = 2; i <= a; i++) {
            if (a % i == 0) {
                list.add(i);
                a = a / i;
                t = i;
                break;
            }
        }
        getNum(a, list, t);
    }

}