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Kotlin-based LeetCode algorithm problem solutions, regularly updated
59\. Spiral Matrix II
Medium
Given a positive integer `n`, generate an `n x n` `matrix` filled with elements from `1` to n2
in spiral order.
**Example 1:**
![](https://assets.leetcode.com/uploads/2020/11/13/spiraln.jpg)
**Input:** n = 3
**Output:** [[1,2,3],[8,9,4],[7,6,5]]
**Example 2:**
**Input:** n = 1
**Output:** [[1]]
**Constraints:**
* `1 <= n <= 20`