华为机试测试- 质数因子

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        Long n=scanner.nextLong();
        System.out.println(convert(n));
        scanner.close();
    } 
    public static String convert(Long n)
    {
        List<Long> list=new ArrayList<Long>();
        Long temp=n;
        for(long i=2;i<=temp/2;i++)
        {
            if(isPrimaryNum(i))
            {
                while(n%i==0)
                {
                    list.add(i);
                    n=n/i;
                }
                if(n==1)
                    break;
            }
        }
        String reStr="";
        for(int i=0;i<list.size();i++)
            reStr+=list.get(i)+" ";
        return reStr.trim();
    }
    
    public static boolean isPrimaryNum(long n)
    {
        if(n<=1)
            return false;
        if(n==2||n==3)
            return true;
        double sq=Math.sqrt(n);
        if(n%2==0)
            return false;
        for(int i=3;i<=sq;i+=2)
        {
            if(n%i==0)
                return false;
        }
        return true;
    }
}