01-ticket-prices/day1.rb

   1
   2 $destination_values = {'Almaty' => 2.0, 'Brorfelde' => 0.9, 'Estacada' => 0.4,
   3   'Jayuya' => 0.6, 'Karlukovo' => 2.2, 'Morgantown' => 2.9,'Nordkapp' => 1.5,
   4   'Nullarbor' => 2.2, 'Puente-Laguna-Garzonkuala-Penyu' => 0.4, 'Uzupis' => 0.9}
   5 $destination_values.default = 1.0
   6
   7 holidays = File.readlines('01-holidays.txt').map {|l| l.chomp.split}
   8
   9 def affordable_holidays(hs)
  10   hs.select {|h| h[1].to_i <= 1200}
  11 end
  12
  13 def value(holiday)
  14   $destination_values[holiday[2]] * holiday[3].to_f / holiday[1].to_i
  15 end
  16
  17 part1 = affordable_holidays(holidays).length
  18 part2 = affordable_holidays(holidays).max_by {|h| value h}.first
  19
  20 puts "Part 1: #{part1}\nPart 2: #{part2}"