Add day2 input/mix task

Author: Gregory Igelmund

elixir/lib/mix/tasks/day2.ex

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+# --- Day 2: Inventory Management System ---
+# You stop falling through time, catch your breath, and check the screen on the
+# device. "Destination reached. Current Year: 1518. Current Location: North
+# Pole Utility Closet 83N10." You made it! Now, to find those anomalies.
+#
+# Outside the utility closet, you hear footsteps and a voice. "...I'm not sure
+# either. But now that so many people have chimneys, maybe he could sneak in
+# that way?" Another voice responds, "Actually, we've been working on a new
+# kind of suit that would let him fit through tight spaces like that. But, I
+# heard that a few days ago, they lost the prototype fabric, the design plans,
+# everything! Nobody on the team can even seem to remember important details of
+# the project!"
+#
+# "Wouldn't they have had enough fabric to fill several boxes in the warehouse?
+# They'd be stored together, so the box IDs should be similar. Too bad it would
+# take forever to search the warehouse for two similar box IDs..." They walk
+# too far away to hear any more.
+#
+# Late at night, you sneak to the warehouse - who knows what kinds of paradoxes
+# you could cause if you were discovered - and use your fancy wrist device to
+# quickly scan every box and produce a list of the likely candidates (your
+# puzzle input).
+#
+# To make sure you didn't miss any, you scan the likely candidate boxes again,
+# counting the number that have an ID containing exactly two of any letter and
+# then separately counting those with exactly three of any letter. You can
+# multiply those two counts together to get a rudimentary checksum and compare
+# it to what your device predicts.
+#
+# For example, if you see the following box IDs:
+#
+# - abcdef contains no letters that appear exactly two or three times.
+# - bababc contains two a and three b, so it counts for both.
+# - abbcde contains two b, but no letter appears exactly three times.
+# - abcccd contains three c, but no letter appears exactly two times.
+# - aabcdd contains two a and two d, but it only counts once.
+# - abcdee contains two e.
+# - ababab contains three a and three b, but it only counts once.
+#
+# Of these box IDs, four of them contain a letter which appears exactly twice,
+# and three of them contain a letter which appears exactly three times.
+# Multiplying these together produces a checksum of 4 * 3 = 12.
+#
+# What is the checksum for your list of box IDs?
+
+defmodule Mix.Tasks.Day2 do
+  use Mix.Task
+
+  def run(_args) do
+    { :ok, input } = File.read("../inputs/day2.txt")
+    IO.puts("My input: #{input}")
+  end
+end

inputs/day2.txt

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