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Spiral Matrix II

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

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

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