solved part 2

README.md

@@ -1,3 +1,8 @@
-# AoC2018
+# Advent of Code 2018
 
-AoC 2018 code.
+This is a repo for my Advent of Code 2018 solutions.
+I'll be trying to solve challenges using Ruby and editing in VS Code to learn both better.
+
+I'm using 2018 challenges as a warm up for 2021 AoC.
+
+Link: https://adventofcode.com/

day01/solution.rb

@@ -0,0 +1,15 @@
+#!/bin/env ruby
+# Sum all numbers in the text file.
+
+# Part 1
+sum = File.readlines('./input').map { |line| line.to_i}.sum
+
+# Part 2
+numbers = File.readlines('./input').map { |line| line.to_i}
+freqs = [0]
+
+numbers.cycle do |num|
+    freqs.push(freqs[-1] + num)
+    break if freqs[0..-2].include?(freqs[-1])
+end
+puts freqs[-1]