spiral-matrix.md

<p>Given a matrix of <em>m</em> x <em>n</em> elements (<em>m</em> rows, <em>n</em> columns), return all elements of the matrix in spiral order.</p>

<p><strong>Example 1:</strong></p>

<pre>
<strong>Input:</strong>
[
 [ 1, 2, 3 ],
 [ 4, 5, 6 ],
 [ 7, 8, 9 ]
]
<strong>Output:</strong> [1,2,3,6,9,8,7,4,5]
</pre>

<p><strong>Example 2:</strong></p>
<pre>
<strong>Input:</strong>
[
  [1, 2, 3, 4],
  [5, 6, 7, 8],
  [9,10,11,12]
]
<strong>Output:</strong> [1,2,3,4,8,12,11,10,9,5,6,7]
</pre>