题解 | #质数因子#

import java.util.Scanner;

// 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);
        Integer num = in.nextInt();
        if (num == 1 || num == 2) System.out.print(num);
        for (int i = 2; i <= Math.sqrt(num); i++) {
            if (num % i == 0) {
                System.out.print(i + " ");
                num = num / i;
                i--;
            }
        }
        if (num > 2) {
            System.out.print(num + " ");
        }
    }
}