Advent of Code 2022 - Day 01

Mix.install([
  {:kino, "~> 0.7.0"}
])

Setup

The input is the amount of calories each food item an elf is carrying contains. Each line represents one item, and each elf is represented by a group of lines (separated by a blank line).

For instance, in the example input, there are 5 different elves.

example_input = """
1000
2000
3000

4000

5000
6000

7000
8000
9000

10000
"""

input = Kino.Input.textarea("Puzzle Input", default: example_input)

Part 1

Find the Elf carrying the most Calories. How many total Calories is that Elf carrying?

input
|> Kino.Input.read()
|> String.split("\n")
|> Enum.chunk_by(&(&1 == ""))
|> Enum.reject(&(&1 == [""]))
|> Enum.map(fn calorie_counts ->
  calorie_counts
  |> Enum.map(&String.to_integer/1)
  |> Enum.sum()
end)
|> Enum.max()

Part 2

Find the top three Elves carrying the most Calories. How many Calories are those Elves carrying in total?

input
|> Kino.Input.read()
|> String.split("\n")
|> Enum.chunk_by(&(&1 == ""))
|> Enum.reject(&(&1 == [""]))
|> Enum.map(fn calorie_counts ->
  calorie_counts
  |> Enum.map(&String.to_integer/1)
  |> Enum.sum()
end)
|> Enum.sort(:desc)
|> Enum.take(3)
|> Enum.sum()