Solved Day 4

day04/input

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day04/input.sample

@@ -0,0 +1,19 @@
+7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
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+
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+ 2  0 12  3  7

day04/solution.rb

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+#!/bin/env ruby
+require 'pry'
+
+# Part 1
+def bingo?(line)
+  line.select { _1.nil? }.count == line.count
+end
+
+bingo = File.readlines('./input')
+draws = bingo[0].strip.split(',').map(&:to_i)
+cards = bingo[1..-1].reject { _1 == "\n" }.map(&:strip)
+                    .each_slice(5)
+                    .map { |card| card.map { _1.split(' ').map(&:to_i) } }
+
+winner = nil
+last_draw = 0
+catch :bingo do
+  draws.each do |draw|
+    last_draw = draw
+    cards.map! { _1.map! { |row| row.map! { |number| number == draw ? nil : number } } }
+    cards.each do |card|
+      card.each { |line| winner = card if bingo?(line) }
+      card.transpose.each { |line| winner = card if bingo?(line) }
+      throw :bingo unless winner.nil?
+    end
+  end
+end
+
+score = winner.flatten.reject(&:nil?).sum * last_draw
+puts "Winning Board Score: #{score}"
+
+# Part 2
+catch :last_winner do
+  draws.each do |draw|
+    last_draw = draw
+    winner = nil
+    cards.map! { _1.map! { |row| row.map! { |number| number == draw ? nil : number } } }
+    cards.each do |card|
+      card.each { |line| winner = card if bingo?(line) }
+      card.transpose.each { |line| winner = card if bingo?(line) }
+      cards.delete(winner) unless winner.nil?
+    end
+    throw :last_winner if cards.count == 0
+  end
+end
+score = winner.flatten.reject(&:nil?).sum * last_draw
+puts "Last Winning Board Score: #{score}"