Leetcode 48 Rotate image

leetcode_48_rotate_image.rb

Leetcode 48 Rotate image

# @param {Integer[][]} matrix
# @return {Void} Do not return anything, modify matrix in-place instead.
def rotate(matrix)
    # Just change row's to column, like [1,2,3] 1st row will become last column
    # Then 2nd row [4,5,6] will become 2nd column and so on
    #ignore: matrix.transpose.reverse
    n = matrix.length
    (0...n).each do |i|
        (0..i).each do |j|
            temp = matrix[i][j]
            matrix[i][j] = matrix[j][i]
            matrix[j][i] = temp
        end
    end
    matrix.each(&:reverse!)
end