hauleth.dev
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Day 3 of 2025
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2025/day02.livemd
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2025/day02.livemd
···
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|> Enum.sum()
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```
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2025/day03.livemd
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2025/day03.livemd
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# Day 03
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```elixir
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Mix.install([:kino_aoc])
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```
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## Section
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```elixir
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{:ok, puzzle_input} =
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KinoAOC.download_puzzle("2025", "3", System.fetch_env!("LB_ADVENT_OF_CODE_SESSION"))
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```
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```elixir
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batteries =
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puzzle_input
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|> String.split("\n", trim: true)
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|> Enum.map(fn row ->
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row
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|> String.to_charlist()
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|> Enum.map(& &1 - ?0)
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end)
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```
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```elixir
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defmodule Joltage do
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def make_largest(list, n) do
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to_remove = length(list) - n
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Enum.reduce(1..to_remove, list, fn _, acc -> make_larger(acc) end)
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end
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def make_larger([_]), do: []
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def make_larger([a, b | rest]) when a < b, do: [b | rest]
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def make_larger([b | rest]), do: [b | make_larger(rest)]
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end
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```
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## Part 1
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```elixir
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Enum.sum_by(batteries, &Integer.undigits(Joltage.make_largest(&1, 2)))
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```
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## Part 2
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```elixir
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Enum.sum_by(batteries, &Integer.undigits(Joltage.make_largest(&1, 12)))
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```
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