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);
        while (in.hasNextInt()) {
            int a = in.nextInt();
            for (int i = 2; i <= a / i; i++) {
                while (a % i == 0) {
                    System.out.print(i + " ");

                    a = a / i;
                }
            }
            if (a != 1) {
                System.out.print(a);
            }

        }

    }
}