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


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.

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
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