johnc219

# Calculate number of triangles (that don't contain triangles) inside a
# Sierpinski triangle
module Sierpinski
  # @param [Integer] n - number of iterations
  # @return [Integer] the number of triangles that don't contain triangles
  #
  # f(n) = 4(f(n - 1) - f(n - 2)) + f(n - 2)
  # T(n) in O(n)
  def self.triangles(n)
    raise 'must be nonnegative' if n < 0

johnc219

## -----------------------------------------------------------------------------
## Replace Type Code With Subclasses
## Replace Conditional with Polymorphism
## -----------------------------------------------------------------------------

# Start

class Animal
  def initialize(type_code)
    @type_code = type_code

johnc219

Raspberry Pi Onboarding Steps

• Updating packages
  • sudo apt-get update
  • sudo apt-get upgrade
  • sudo apt-get clean
  • sudo apt-get autoremove
• Installing Vim
  • sudo apt-get vim
• Apply a .vimrc
• Change default editor