I Problem

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]]

I Problem

Given an m x n matrix, return all elements of the matrix in spiral order.

Example 1

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

Example 2

Input: matrix = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]]
Output: [1, 2, 3, 4, 8, 12, 11, 10, 9, 5, 6, 7]