diff --git a/day01/solution.rb b/day01/solution.rb
index ca7f70c..4789804 100755
--- a/day01/solution.rb
+++ b/day01/solution.rb
@@ -1,29 +1,23 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require 'pry'
 
 # Part 1
 
-real_input = File.read("./input")
-sample = '3   4
-4   3
-2   5
-1   3
-3   9
-3   3'
+real_input = File.read('./input')
 
 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
+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
+# binding.pry
 
-solution = col1.zip(col2).map{ | left, right | (right - left).abs }.sum
+solution = col1.zip(col2).map { |left, right| (right - left).abs }.sum
 puts solution
 
 # Part 2
 
-p2 = col1.map{ | value | value * col2.count(value)}.sum
+p2 = col1.map { |value| value * col2.count(value) }.sum
 puts p2
-