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2024 day 02
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2024/day01.livemd
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2024/day01.livemd
···
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|> Enum.sum()
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```
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2024/day02.livemd
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2024/day02.livemd
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# Day 02
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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("2024", "2", System.fetch_env!("LB_ADVENT_OF_CODE_SESSION"))
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```
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```elixir
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inputs =
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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.split(" ", trim: true)
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|> Enum.map(&String.to_integer/1)
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end)
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```
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```elixir
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defmodule Day02 do
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def correct?([a, b | _] = input) do
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cmp = if a > b, do: &>/2, else: &</2
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valid? = fn [c, d] -> abs(c - d) in 1..3 and cmp.(c, d) end
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input
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|> Enum.chunk_every(2, 1, :discard)
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|> Enum.all?(valid?)
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end
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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.count(inputs, &Day02.correct?/1)
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```
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## Part 2
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```elixir
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Enum.count(inputs, fn row ->
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Enum.any?(0..length(row), fn idx ->
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row |> List.delete_at(idx) |> Day02.correct?()
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end)
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end)
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```
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