#!/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