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.hasNext()) { 
            long n = in.nextLong();
            long i=2;
            if(n/i==1){
                System.out.println(n);
            }
            while(n/i!=1){
                if(n%i==0){
                    System.out.print(i+" ");
                    n=n/i;
                }else{
                    if(i==2){
                        i++;
                    }else{
                        i=i+2;
                    }
                }
                if(isPrime(n)){
                    System.out.print(n);
                    break;
                }
            }
        }
    }
    public static boolean isPrime(long x){
        int j=0;
        for(j=2;j<=Math.sqrt(x);j++){
            if(x%j==0){
                return false;
            }
        }
        return true;
    }
}