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Spiral matrix generator

Instructions

Given integer n implement a function which generates a spiral numbers matrix (size n x n). Numbers in matrix are placed according to spiral - starting top left corner and then go right, down, left, up, right...

Challenge | Solution

Examples

Example 1

generate_spiral(2)
   [[1, 2],
   [4, 3]]

Example 2

generate_spiral(3)
   [[1, 2, 3],
   [8, 9, 4],
   [7, 6, 5]]

Example 3

generate_spiral(4)
   [[1,   2,  3, 4],
   [12, 13, 14, 5],
   [11, 16, 15, 6],
   [10,  9,  8, 7]]