Make space for two-digit days

2019/day4/part2.rb

@@ -1,40 +0,0 @@
-# frozen_string_literal: true
-
-input = '' # TODO
-range = Range.new(*input.split('-').map(&:to_i))
-
-def pairwise(arr)
-  arr[0...-1].zip(arr[1..])
-end
-
-def runs(digits)
-  runs = []
-  ref = digits.first
-  run = ref.to_s
-  digits[1..].each do |d|
-    if d == ref
-      run += d.to_s
-    else
-      runs << run
-      ref = d
-      run = ref.to_s
-    end
-  end
-  runs << run
-end
-
-count = range.count do |n|
-  # 1. All numbers in this range are six digits
-  # 2. All numbers in this range are in this range
-
-  digits = n.digits.reverse
-
-  # 3. Two adjacent digits are the same
-  double = runs(digits).any? { |run| run.length == 2 }
-
-  # 4. Going from left to right, the digits *never decrease*
-  monotonic = pairwise(digits).none? { |pair| pair.last < pair.first }
-
-  double && monotonic
-end
-pp count