hauleth.dev
+13
-18
2022/day05.livemd
+13
-18
2022/day05.livemd
···
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moves
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|> String.split("\n", trim: true)
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|> Enum.map(fn move ->
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-
result = Regex.named_captures(~r/move (?<count>\d+) from (?<from>\d) to (?<to>\d)/, move)
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-
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-
%{
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count: String.to_integer(result["count"]),
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-
from: String.to_integer(result["from"]),
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-
to: String.to_integer(result["to"])
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-
}
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+
Regex.named_captures(~r/move (?<count>\d+) from (?<from>\d) to (?<to>\d)/, move)
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+
|> Map.new(fn {k, v} -> {String.to_atom(k), String.to_integer(v)} end)
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end)
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crates =
···
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55
end)
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end)
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|> Enum.zip()
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-
|> Enum.map(&Tuple.to_list/1)
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-
|> Enum.map(fn column -> Enum.drop_while(column, &is_nil/1) end)
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+
|> Enum.map(fn column -> column |> Tuple.to_list() |> Enum.drop_while(&is_nil/1) end)
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|> Enum.with_index(1)
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|> Map.new(fn {v, k} -> {k, v} end)
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61
```
···
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85
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Map.update!(columns, to, &(moved ++ &1))
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end
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+
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+
def eval(crates, moves, reverse? \\ true) do
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+
moves
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+
|> Enum.reduce(crates, &Day05.move(&1, &2, reverse?))
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+
|> Enum.sort()
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+
|> Enum.map(fn {_, v} -> hd(v) end)
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+
end
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end
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```
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<!-- livebook:{"output":true} -->
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```
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-
{:module, Day05, <<70, 79, 82, 49, 0, 0, 10, ...>>, {:move, 3}}
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+
{:module, Day05, <<70, 79, 82, 49, 0, 0, 13, ...>>, {:eval, 3}}
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```
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## Task 1
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```elixir
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-
moves
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-
|> Enum.reduce(crates, &Day05.move/2)
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-
|> Enum.sort()
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-
|> Enum.map(fn {_, v} -> hd(v) end)
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+
Day05.eval(crates, moves)
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108
```
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<!-- livebook:{"output":true} -->
···
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## Task 2
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```elixir
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-
moves
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-
|> Enum.reduce(crates, &Day05.move(&1, &2, false))
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-
|> Enum.sort()
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-
|> Enum.map(fn {_, v} -> hd(v) end)
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+
Day05.eval(crates, moves, false)
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120
```
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<!-- livebook:{"output":true} -->