题解 | #蛇形矩阵#

import java.util.Scanner;

public class Main {


    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int[][] a = new int[N + 1][N + 1];
        int p = 0;
        for (int i = 1; i <= N; i++) {
            int j = i, k = 1;
            while (j >= 1 && k <= i) {
                a[j][k] = ++p;
                j--;
                k++;
            }
        }
        for (int i = 1; i <= N; i++) {
            for (int j = 1; j <= N - i + 1; j++) {
                System.out.print(a[i][j] + " ");
            }
            System.out.println();
        }
    }
}