commit 64ac2206f2b672c1d3ea6f17fff87b82114a9f40 · hauleth.dev/advent-of-code

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2025/day06.livemd

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       # Day 06

     

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       ```elixir

     

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       Mix.install([:kino_aoc])

     

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       ```

     

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       ## Setup

     

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       <!-- livebook:{"attrs":"eyJhc3NpZ25fdG8iOiJwdXp6bGVfaW5wdXQiLCJkYXkiOiI2Iiwic2Vzc2lvbl9zZWNyZXQiOiJBRFZFTlRfT0ZfQ09ERV9TRVNTSU9OIiwieWVhciI6IjIwMjUifQ","chunks":null,"kind":"Elixir.KinoAOC.HelperCell","livebook_object":"smart_cell"} -->

     

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       ```elixir

     

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       {:ok, puzzle_input} =

     

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         KinoAOC.download_puzzle("2025", "6", System.fetch_env!("LB_ADVENT_OF_CODE_SESSION"))

     

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       ```

     

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       ```elixir

     

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       {tasks, [ops]} =

     

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         puzzle_input

     

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         |> String.split("\n", trim: true)

     

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         |> Enum.split(-1)

     

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       ```

     

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       ```elixir

     

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       ops =

     

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         ops

     

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         |> String.split()

     

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         |> Enum.map(&String.to_atom/1)

     

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       ```

     

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       ## Part 1

     

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       ```elixir

     

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       tasks

     

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       |> Enum.map(&String.split/1)

     

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       |> Enum.zip_with(fn numbers -> Enum.map(numbers, &String.to_integer/1) end)

     

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       |> Enum.zip(ops)

     

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       |> Enum.sum_by(fn

     

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         {nums, :+} -> Enum.sum(nums)

     

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         {nums, :*} -> Enum.product(nums)

     

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       end)

     

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       ```

     

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       ## Part 2

     

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       ```elixir

     

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       tasks

     

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       |> Enum.map(&String.to_charlist/1)

     

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       |> Enum.zip_with(&(&1 |> List.to_string() |> String.trim()))

     

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       |> Enum.chunk_while(

     

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         [],

     

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         fn

     

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           "", acc -> {:cont, acc, []}

     

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           num, acc -> {:cont, [String.to_integer(num) | acc]}

     

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         end,

     

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         &{:cont, &1, []}

     

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       )

     

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       |> Enum.zip(ops)

     

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       |> Enum.sum_by(fn

     

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         {nums, :+} -> Enum.sum(nums)

     

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         {nums, :*} -> Enum.product(nums)

     

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       end)

     

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       ```

     

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       <!-- livebook:{"offset":1229,"stamp":{"token":"XCP.uuy6Ksg23kO8DXLs0nEHWRa2q8MnTF00fl1kNBDi-xlsQ1DZ_teumvy__d8PZSNG_VIsQ9fTr1rGiHu3aFBxxeOD5uVO2plujrne43wrcKxIt7wi6AInBo9LuC1gXgwFgw","version":2}} -->