题解 | #蛇形矩阵#

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);
        // 注意 hasNext 和 hasNextLine 的区别
        // while (in.hasNextInt()) { // 注意 while 处理多个 case
        //     int a = in.nextInt();
        //     int b = in.nextInt();
        //     System.out.println(a + b);
        // }
        int num = in.nextInt();
        int[][] table = new int[num][num];


        int number = 1;
        for (int i = 0; i < num; i++) {
            int m = i, n = 0;
            while (m >= 0 && n <= i) {
                table[m][n] = number++;
                m--;
                n++;
            }
        }
        for (int i = 0; i < num; i++) {
            for (int j = 0; j < num - i; j++) {
                System.out.print(table[i][j] + " ");
            }
            System.out.println();
        }
    }
}