题解 | #蛇形矩阵#

import java.util.*;

// 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 scanner = new Scanner(System.in);
        int sum = Integer.parseInt(scanner.nextLine());
        for (int i = 1; i <= sum; i++) {
            List<Integer> lists = new ArrayList<>();
            lists.add((i * i - i + 2) / 2);
            for (int n = 1; n <= sum - i; n++) {
                lists.add(lists.get(n - 1) + i + n);
            }
            StringBuffer stringBuffer = new StringBuffer();
            for (Integer list : lists) {
                stringBuffer.append(String.valueOf(list)).append(" ");
            }
            System.out.println(stringBuffer.toString());
        }
    }


}