题解 | #蛇形矩阵#

找规律：每行元素差值依次递增

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);
        int N = in.nextInt();
        for (int r = 1, i = 1; i <= N; r += i++) {
            for (int c = r, j = i; j <= N; c += ++j) {
                System.out.print(c + " ");
            }
            System.out.println();
        }
    }
}