#!/usr/bin/env ruby

data = File.read("data.txt")

data = data.split("\n")
data = data.map(&:split)

first_row = data.map { |data| data[0] }.sort
second_row = data.map { |data| data[1] }.sort

merged = first_row.zip(second_row)

distance = merged.map do |row|
  (row[0].to_i - row[1].to_i).abs
end.sum

p distance