题解 | #蛇形矩阵#

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int N = Integer.valueOf(scan.nextLine().trim());
        if (N == 1) {
            System.out.println(1);
            return;
        }
        int[][] ans = new int[N][];
        int index = 1;
        for (int i = 0; i < ans.length; i++) {
            ans[i] = new int[N - i];
            for (int j = 0; j < ans[i].length; j++) {
                if (i == 0 && j == 0) {
                    ans[i][j] = 1;
                } else if (j == 0) {
                    ans[i][j] = ans[i - 1][j] + i;
                } else {
                    ans[i][j] = ans[i][j - 1] + index + j;
                }
                if (j == ans[i].length - 1) {
                    System.out.println(ans[i][j]);
                    break;
                }
                System.out.print(ans[i][j] + " ");
            }
            index++;
        }
    }
}