0054-spiral-matrix.rb

# frozen_string_literal: true

# 54. Spiral Matrix
# https://leetcode.com/problems/spiral-matrix

=begin

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

=end

# @param {Integer[][]} matrix
# @return {Integer[]}
defspiral_order(matrix)
(row=matrix.shift) ? row + spiral_order(matrix.transpose.reverse) : []
end

# **************** #
# TEST #
# **************** #

require"test/unit"
classTest_spiral_order < Test::Unit::TestCase
deftest_
assert_equal[1,2,3,6,9,8,7,4,5],spiral_order([[1,2,3],[4,5,6],[7,8,9]])
assert_equal[1,2,3,4,8,12,11,10,9,5,6,7],spiral_order([[1,2,3,4],[5,6,7,8],[9,10,11,12]])
end
end