commit b665d6b11b512dc2fa9ec9622510c859e0337e1a · hauleth.dev/advent-of-code

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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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       # 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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