Able code interview

find_aunt.rb

CHECKERS = {
  'cats'        => :>,
  'trees'       => :>,
  'pomeranians' => :<,
  'goldfish'    => :<,
}

def find_aunt(criteria, input)
  input.scan(/Sue (\d+): (.*)\n/).find do |(number, data)|
    break number if data.scan(/(\w+): (\d+)/).all? do |(item, value)|
      value.to_i.public_send(CHECKERS[item] || :eql?, criteria[item])
    end
  end
end

criteria = {
  'children'    => 3,
  'cats'        => 7,
  'samoyeds'    => 2,
  'pomeranians' => 3,
  'akitas'      => 0,
  'vizslas'     => 0,
  'goldfish'    => 5,
  'trees'       => 3,
  'cars'        => 2,
  'perfumes'    => 1,
}

puts find_aunt(criteria, <<-INPUT)
INPUT

santa_movementrs.rb

require 'set'

MOVEMENTS = {
  '^' => [ 0, -1],
  'v' => [ 0,  1],
  '>' => [ 1,  0],
  '<' => [-1,  0],
}.freeze

def count_places(input)
  operators = [[0, 0], [0, 0]].cycle
  input.split('').each_with_object(Set.new([[0, 0]])) do |step, items|
    items << move_operator(operators.next, step).dup
  end.size
end

def move_operator(input, direction)
  x, y = MOVEMENTS[direction]
  input.replace([input[0] + x, input[1] + y])
end

puts count_places(<<-INPUT.gsub(/\s/, ''))
INPUT