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g0001_0100.s0059_spiral_matrix_ii.readme.md Maven / Gradle / Ivy

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`