题解 | #蛇形矩阵#--利用二维数组

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int num = in.nextInt();
        // 利用二维数组
        int[][] arr = new int[num][num];
        for (int i = 0; i < num; i++) {
            for (int j = 0; j < num - i; j++) {
                if (i == 0 && j == 0) {
                    arr[i][j] = 1;
                } else if (i != 0 && j == 0) {
                    arr[i][j] = arr[i - 1][j] + i;
                } else {
                    arr[i][j] = arr[i][j - 1] + i + j + 1;
                }
                System.out.print(arr[i][j] + " ");
            }
            System.out.println();
        }
    }
}