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Spiral Matrix
Difficulty: Medium
Category: DSA
Topics: Array, Matrix, Simulation
Asked at: Microsoft, Apple, Intuit, Facebook, Google, Amazon, ByteDance, Expedia, Paypal, eBay
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]
```
**Constraints:**
- `m == matrix.length`
- `n == matrix[i].length`
- `1 <= m, n <= 10`
- `-100 <= matrix[i][j] <= 100`
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