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

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

Example 1:
Input: 3
Output: [[1,2,3],[8,9,4],[7,6,5]]
Constraints:

  • 1≤n≤201 \leq n \leq 20

Input
arr =3

Generate 3×3 spiral matrix

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3 × 3 Matrix
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