#!/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