题解 | #查找组成一个偶数最接近的两个素数#

import java.util.*;

public class Main {
    public static void main(String [] args) {
        Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();
        int left = 0;
        int right = 0;
        int mid = num / 2;
        if(num == 4){
            left = 2;
        }else if (mid % 2 == 0) {
            for (int i = 0; i < mid / 2; i++) {
                if (calc(mid - 2 * i - 1) && calc(mid + 2 * i + 1)) {
                    left = mid - 2 * i - 1;
                    break;
                }
            }
        } else {
            for (int i = 0; i < mid / 2; i++) {
                if (calc(mid - 2 * i) && calc(mid + 2 * i)) {
                    left =mid - 2 * i;
                    break;
                }
            }
        }

        System.out.println(left);
        System.out.println(num-left);
    }

    public static boolean calc(int num) {
        for (int i = 2; i <= Math.sqrt(num); i++) {
            if (num % i == 0) {
                return false;
            }
        }
        return true;
    }
}