Day 7

2023/day7/p1.rb

@@ -0,0 +1,42 @@
+class PokerHand
+  include Comparable
+
+  attr_reader :hand, :bet, :type
+
+  def initialize(hand, bet)
+    @hand = hand.gsub('A', 'Z').gsub('K', 'Y').gsub('Q', 'X').gsub('J', 'W').gsub('T', 'V')
+    @bet = bet
+    @type = get_hand_type
+    puts @type
+  end
+
+  def get_hand_type
+    num_unique_cards = @hand.chars.uniq.length
+    unique_map = @hand.chars.group_by(&:itself).map { |_char, instances| instances.length }
+    return 1 if num_unique_cards == 1
+    return 2 if (num_unique_cards == 2) && unique_map.include?(4)
+    return 3 if num_unique_cards == 2
+    return 4 if (num_unique_cards == 3) && unique_map.include?(3)
+    return 5 if num_unique_cards == 3
+    return 6 if num_unique_cards == 4
+
+    7
+  end
+
+  def <=>(other)
+    if @type == other.type
+      @hand <=> other.hand
+    else
+      other.type <=> @type
+    end
+  end
+end
+
+hands = File.foreach('./2023/day7/data').map { |line| PokerHand.new(line.split(' ')[0], line.split(' ')[1].to_i) }
+
+hands.sort!
+ret = 0
+hands.each_with_index do |hand, i|
+  ret += hand.bet * (i + 1)
+end
+puts ret

2023/day7/p2.rb

@@ -0,0 +1,42 @@
+class PokerHand
+  include Comparable
+
+  attr_reader :hand, :bet, :type
+
+  def initialize(hand, bet)
+    @hand = hand.gsub('A', 'Z').gsub('K', 'Y').gsub('Q', 'X').gsub('J', '0').gsub('T', 'V')
+    @bet = bet
+    @type = get_hand_type hand.gsub('J', '')
+  end
+
+  def get_hand_type hand
+    num_unique_cards = hand.chars.uniq.length
+    num_jokers = 5 - hand.length
+    unique_map = hand.chars.group_by(&:itself).map { |_char, instances| instances.length }
+    return 1 if num_unique_cards == 1 || num_jokers == 5
+    return 2 if (num_unique_cards == 2) && unique_map.include?(4 - num_jokers)
+    return 3 if num_unique_cards == 2
+    return 4 if (num_unique_cards == 3) && unique_map.include?(3 - num_jokers)
+    return 5 if num_unique_cards == 3
+    return 6 if num_unique_cards == 4
+
+    7
+  end
+
+  def <=>(other)
+    if @type == other.type
+      @hand <=> other.hand
+    else
+      other.type <=> @type
+    end
+  end
+end
+
+hands = File.foreach('./2023/day7/data').map { |line| PokerHand.new(line.split(' ')[0], line.split(' ')[1].to_i) }
+
+hands.sort!
+ret = 0
+hands.each_with_index do |hand, i|
+  ret += hand.bet * (i + 1)
+end
+puts ret