day 22, part 1

Author: robbkidd

2024/ruby/day22.rb

@@ -0,0 +1,25 @@
+require_relative 'day'
+require 'parallel'
+
+class Day22 < Day # >
+
+  # @example
+  #   day.part1 #=> 37327623
+  def part1
+    initial_secret_numbers = input.split("\n").map(&:to_i)
+    Parallel.map(initial_secret_numbers) { |initial_secret_number|
+      2000.times.inject(initial_secret_number) { |secret_number, _|
+        secret_number = ((secret_number * 64) ^ secret_number) % 16777216
+        secret_number = ((secret_number / 32).floor ^ secret_number) % 16777216
+        secret_number = ((secret_number * 2048) ^ secret_number) % 16777216
+      }
+    }.reduce(&:+)
+  end
+
+  # @example
+  #   day.part2 #=> 'how are you'
+  def part2
+  end
+
+  EXAMPLE_INPUT = File.read("../inputs/day22-example-input.txt")
+end