题解 | 小红的排列构造①-Java

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);
        int n = in.nextInt();
        int[] arr = new int[n];

        if (n <= 2) System.out.println(-1);
        else {
            arr[0] = 3;
            for (int i = 1; i < n; i++) {
                arr[i] = i + 1;
            }
            arr[2] = 1;
            for (int a : arr) {
                System.out.print(a + " ");
            }
        }
    }
}