Problems/54. Spiral Matrix

54. Spiral Matrix

MediumArrayMatrixSimulation

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]

Traverse in a clockwise direction starting from the top-left element: right -> down -> left -> up -> right.

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]

Traverse in a spiral fashion wrapping around the grid boundaries.

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