Hi everyone!
This is my first year doing Advent of Code. Here’s my solution for Day 1:
defmodule AdventOfCode.DayOne do
def part_one(input) do
input
|> parse_input()
|> get_distances()
|> Enum.sum()
end
def part_two(input) do
input
|> parse_input()
|> get_similarity_scores()
|> Enum.sum()
end
defp parse_input(input) do
input
|> String.split("\n")
|> Enum.map(fn line ->
line
|> String.trim()
|> String.split()
|> Enum.map(&String.to_integer/1)
|> List.to_tuple()
end)
|> Enum.unzip()
|> Tuple.to_list()
end
defp get_distances(input) do
input
|> Enum.map(&Enum.sort/1)
|> Enum.zip_with(fn [l, r] -> abs(l - r) end)
end
defp get_similarity_scores(input) do
[left_column, right_column] = input
Enum.map(left_column, fn n ->
n * Enum.count(right_column, &(&1 === n))
end)
end
end
