Resolve day 1

01/script.rb

@@ -0,0 +1,23 @@
+#!/usr/bin/env ruby
+
+require_relative '../common'
+
+class Day01 < Day
+  def part1
+    measurements.each_with_index.inject(0) do |count, (value, i)|
+      i > 0 && value > measurements[i - 1] ? count.succ : count
+    end
+  end
+
+  def part2
+    measurements.size.times.select do |i|
+      i > 2 && measurements[i - 2, 3].sum > measurements[i - 3, 3].sum
+    end.size
+  end
+
+  def measurements
+    @measurements ||= input.map(&:to_i)
+  end
+end
+
+Day01.run