Spiral Order Matrix I

Given a matrix of m * n elements (m rows, n columns), return all elements of the matrix in spiral order.

Example:

Given the following matrix:

[
    [ 1, 2, 3 ],
    [ 4, 5, 6 ],
    [ 7, 8, 9 ]
]

You should return

[1, 2, 3, 6, 9, 8, 7, 4, 5]

Problem Approach :

Complete solution in the hints.

Hints

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