50. Spiral Matrix

MediumMatrix

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

Examples

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

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

Explanation: Spiral inward starting from the top-left corner.

Constraints

  • m == matrix.length
  • n == matrix[i].length
  • 1 <= m, n <= 10
  • -100 <= matrix[i][j] <= 100
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