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54. Spiral Matrix

Medium


Given an m x n matrix, return all elements of the matrix in spiral order.

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Example 1:

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+Input: matrix = [[1,2,3],[4,5,6],[7,8,9]]
+Output: [1,2,3,6,9,8,7,4,5]
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Example 2:

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+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]
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Constraints:

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