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 midNums = 0;
            if ((a & 1) == 1) {
                midNums = a / 2 + 1;
            }
            int max = (a + 1) * (a / 2) + midNums;
            int[][] result = new int[a][a];
            int cur = 1;
            for (int i = 0; i < a; i++) {
                for (int j = 0; j <= i; j++) {
                    result[i-j][j] = cur++;
                }
            }
             for (int i = 0; i < a; i++) {
                for (int j = 0; j < a-i; j++) {
                    System.out.print(result[i][j] + " ");
                }
                if (i< a-1) {
                    System.out.print("\n");
                }
            }

        }
    }
}