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 sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[][] matrix = new int[n][n];
        matrix[0][0] = 1;
        for (int i = 1; i < matrix[0].length; i++) {
            // 第一行的通项公式
            matrix[0][i] = (i + 1 + 1) * (i + 1) / 2;
        }
        for (int i = 1; i < matrix.length; i++) {
            for (int j = 0; j < n - i; j++) {
                matrix[i][j] = matrix[i-1][j] + i + j;
            }
        }
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < n - i; j++) {
                System.out.print(matrix[i][j] + " ");
            }
            System.out.println();
        }
    }
}