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 in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            int a = in.nextInt();
            int x=a;
            int init=1;
            int hang=1;
            while(x>0){
                int y=x-1;
                int j=hang+1;
                int current=init;
                StringBuilder out=new StringBuilder().append(current).append(" ");
                while(y>0){
                    current+=j;
                    out.append(current).append(" ");
                    y--;
                    j++;
                }
                System.out.println(out.toString());
                x--;
                init+=hang;
                hang++;
                
            }
        }
    }
}