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);
        int n = in.nextInt();
        int first = 1;
        for(int i = 1; i <= n; i++){
            first = first + i -1;
            int sum = i+1; 
            for(int j = 1; j <= n-i+1 ; j++){
                if(j == 1) System.out.print(first);
                else if(j>1 && j<n-i+1){
                    System.out.print(" " + (sum+first));
                    sum = sum + i + j;
                }else if(j == (n-i+1)){
                    System.out.println(" " + (sum+first));
                }
            }
        }
    }
}