rotate_image.rb

# @param {Integer[][]} matrix
# @return {Void} Do not return anything, modify matrix in-place instead.
def rotate(matrix)
    matrix_length = matrix.length
    x = 0
    y = 0
    
    while x < matrix_length
        y = x
     while y < matrix_length
        temp = matrix[x][y]
        matrix[x][y] = matrix[y][x] # 0 - 0, 0,1 - 1,0
        matrix[y][x] = temp
         
        y += 1
     end
       x += 1
    end
    
    x = 0
    
    while x < matrix_length
        y = 0
        while y < (matrix_length / 2)
            temp = matrix[x][y]
            matrix[x][y] = matrix[x][matrix_length - 1 - y] # 0,0 - 0,2, 1,0 - 1,2
            matrix[x][matrix_length - 1 - y] = temp
            y += 1 # 0, 1
        end
        x += 1
    end
    
    matrix
end