题解 | 分解质因数

import java.util.Scanner;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

// 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) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));

        Long n = Long.parseLong(br.readLine().trim());

        for (long i = 2; i * i <= n; i++) {
            while (n % i == 0) {
                out.print(i+" ");
                n/=i;
            }
        }
        if(n>1){
            out.print(n+" ");
        }

        out.flush();
        out.close();
        br.close();
    }
}