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

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