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);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int a = in.nextInt();
            while (a % 2 == 0) {
                System.out.print(2 + " ");
                a /= 2;
            }
            for (int i = 3; i * i <= a; i += 2) {
                while (a % i == 0) { //prime factor
                    System.out.print(i + " ");;
                    a /= i;
                }
            }
            if (a > 2) { //a = 5  i=3 add a
                System.out.println(a);
            }
        }
    }
}