2023/day6.exs

@@ -1,69 +0,0 @@
-#!/usr/bin/env elixir
-defmodule Day6 do
-  def part1(input) do
-    input
-    |> Enum.map(fn line -> Enum.map(line, &String.to_integer/1) end)
-    |> Enum.zip()
-    |> Enum.map(fn {race, record} -> count_winning(race, record) end)
-    |> Enum.product()
-  end
-
-  def count_winning(race, record) do
-    scores = for n <- 1..div(race, 2), do: n * (race - n)
-    [_middle | rev_no_middle] = reversed = Enum.reverse(scores)
-    scores = scores ++ if rem(race, 2) == 1, do: reversed, else: rev_no_middle
-    Enum.count(scores, fn score -> score > record end)
-  end
-
-  def part2(input) do
-    [race, record] = Enum.map(input, fn line -> line |> Enum.join() |> String.to_integer() end)
-    count_winning(race, record)
-  end
-
-  def input do
-    with [input_filename] <- System.argv(),
-         {:ok, input} <- File.read(input_filename) do
-      input
-      |> String.split("\n", trim: true)
-      |> Enum.map(fn line ->
-        line
-        |> String.split()
-        |> Enum.drop(1)
-      end)
-    else
-      _ -> :error
-    end
-  end
-
-  #######################
-  # HERE BE BOILERPLATE #
-  #######################
-
-  def run do
-    case input() do
-      :error -> print_usage()
-      input -> run_parts_with_timer(input)
-    end
-  end
-
-  defp run_parts_with_timer(input) do
-    run_with_timer(1, fn -> part1(input) end)
-    run_with_timer(2, fn -> part2(input) end)
-  end
-
-  defp run_with_timer(part, fun) do
-    {time, result} = :timer.tc(fun)
-    IO.puts("Part #{part} (completed in #{format_time(time)}):\n")
-    IO.puts("#{inspect(result)}\n")
-  end
-
-  defp format_time(μsec) when μsec < 1_000, do: "#{μsec}μs"
-  defp format_time(μsec) when μsec < 1_000_000, do: "#{μsec / 1000}ms"
-  defp format_time(μsec), do: "#{μsec / 1_000_000}s"
-
-  defp print_usage do
-    IO.puts("Usage: elixir day6.exs input_filename")
-  end
-end
-
-# Day6.run()