AdventOfCode/day10/day10part1.exs
2020-12-10 17:48:38 +09:00

23 lines
461 B
Elixir

defmodule Day10Part1 do
def run do
input =
File.read!("input")
|> String.split("\n", trim: true)
|> Enum.map(&String.to_integer/1)
max = Enum.max(input)
outlet = 0
built_in = max + 3
jolts =
[outlet, built_in | input]
|> Enum.sort()
|> Enum.chunk_every(2, 1, :discard)
|> Enum.map(fn [a, b] -> b - a end)
|> Enum.frequencies()
IO.puts(jolts[1] * jolts[3])
end
end
Day10Part1.run()