Solved

day01/solution.rb

@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+
+require 'pry'
+
+# Part 1
+
+real_input = File.read("./input")
+sample = '3   4
+4   3
+2   5
+1   3
+3   9
+3   3'
+
+input = real_input
+
+col1 = input.split("\n").map(&:split).map{ | pair | pair[0].to_i}.sort
+col2 = input.split("\n").map(&:split).map{ | pair | pair[1].to_i}.sort
+
+#binding.pry
+
+solution = col1.zip(col2).map{ | left, right | (right - left).abs }.sum
+puts solution
+
+# Part 2
+
+p2 = col1.map{ | value | value * col2.count(value)}.sum
+puts p2
+