题解 | #质数因子#

using System;
using System.Collections.Generic;
public class Program {
    public static void Main() {
        int num = Convert.ToInt32(Console.ReadLine());
        if (IsRight(num)) {
            Console.Write(num);
        } else {
            int min = FindMin(num);
            int max = num / min;
            Console.Write(min + " ");

            while (!IsRight(max)) {
                int m = FindMin(max);
                Console.Write(m + " ");
                max = max/m;
            }
            Console.Write(max);
        }
    }

    public static int FindMin(int num) {
        for (int i = 2; i <= num / 2; i++) {
            if (num % i == 0) {
                return i;
            }
        }
        return num;
    }

    // true 是质数
    public static bool IsRight(int num) {
        bool isRight = true;
        for (int i = 2; i < num / 2; i++) {
            if (num % i == 0) {
                isRight = false;
                break;
            }
        }
        return isRight;
    }
}