LeetCode 59. Spiral Matrix II--输入一个正整数，顺时针打印从1到n^2组成二维数组

Given a positive integer n, generate an n x n matrix filled with elements from 1 to n2 in spiral order.

Example 1:

Input: n = 3
Output: [[1,2,3],[8,9,4],[7,6,5]]

Example 2:

Input: n = 1
Output: [[1]]

 

Constraints:

• 1 <= n <= 20

以下代码是自主开发：

import com.alibaba.fastjson.JSON;


/**
 * @Desc
 * @Author you gues