hauleth.dev
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2022/day05.livemd
+131
2022/day05.livemd
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<!-- livebook:{"persist_outputs":true} -->
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# Day 05
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```elixir
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Mix.install([
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{:kino_aoc, git: "https://github.com/ljgago/kino_aoc"}
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])
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```
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<!-- livebook:{"output":true} -->
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```
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:ok
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```
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## Setup
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<!-- livebook:{"attrs":{"day":"5","session_secret":"ADVENT_OF_CODE_SESSION","variable":"puzzle_input","year":"2022"},"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("2022", "5", System.fetch_env!("LB_ADVENT_OF_CODE_SESSION"))
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```
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<!-- livebook:{"output":true} -->
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```
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{:ok,
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"[N] [C] [Q] \n[W] [J] [L] [J] [V]\n[F] [N] [D] [L] [S] [W]\n[R] [S] [F] [G] [R] [V] [Z]\n[Z] [G] [Q] [C] [W] [C] [F] [G]\n[S] [Q] [V] [P] [S] [F] [D] [R] [S]\n[M] [P] [R] [Z] [P] [D] [N] [N] [M]\n[D] [W] [W] [F] [T] [H] [Z] [W] [R]\n 1 2 3 4 5 6 7 8 9 \n\nmove 1 from 3 to 9\nmove 3 from 5 to 3\nmove 4 from 2 to 5\nmove 4 from 1 to 2\nmove 3 from 5 to 7\nmove 3 from 1 to 2\nmove 4 from 8 to 7\nmove 4 from 9 to 7\nmove 4 from 2 to 7\nmove 2 from 3 to 6\nmove 3 from 6 to 2\nmove 5 from 4 to 7\nmove 7 from 3 to 7\nmove 5 from 6 to 9\nmove 2 from 4 to 8\nmove 1 from 3 to 2\nmove 4 from 2 to 7\nmove 2 from 2 to 8\nmove 8 from 8 to 5\nmove 1 from 2 to 4\nmove 1 from 2 to 9\nmove 7 from 5 to 4\nmove 31 from 7 to 1\nmove 9 from 9 to 3\nmove 12 from 1 to 9\nmove 15 from 1 to 7\nmove 4 from 3 to 8\nmove 2 from 5 to 1\nmove 12 from 7 to 5\nmove 2 from 8 to 2\nmove 12 from 5 to 4\nmove 1 from 3 to 5\nmove 6 from 1 to 3\nmove 1 from 1 to 5\nmove 1 from 8 to 7\nmove 1 from 8 to 5\nmove 7 from 7 to 8\nmove 5 from 8 to 2\nmove 11 from 4 to 2\nmove 10 from 3 to 1\nmove 1 from 7 to 5\nmove 10 from 1 to 3\nmove 5 from 4 to 2\nmove 1 from 4 to 6\nmove 7 from 2 to 3\nmove 9 from 9 to 5\nmove 15 from 2 to 3\nmove 1 from 9 to 1\nmove 7 from 5 to 3\nmove 1 from 2 to 4\nmove 2 from 9 to 2\nmove 1 from 8 to 9\nmove 5 from 5 to 3\nmove 1 from 8 to 7\nmove 1 from 2 to 4\nmove 1 from 7 to 6\nmove 1 from 1 to 6\nmove 1 from 6 to 9\nmove 1 from 5 to 4\nmove 1 from 6 to 4\nmove 1 from 6 to 8\nmove 2 from 9 to 4\nmove 12 from 3 to 1\nmove 8 from 4 to 8\nmove 1 from 9 to 8\nmove 10 from 8 to 6\nmove 1 from 6 to 7\nmove 6 from 6 to 9\nmove 1 from 2 to 7\nmove 1 from 4 to 7\nmove 2 from 7 to 3\nmove 1 from 1 to 3\nmove 6 from 9 to 1\nmove 2 from 6 to 7\nmove 12 from 1 to 3\nmove 5 from 1 to 9\nmove 1 from 7 to 3\nmove 38 from 3 to 7\nmove 19 from 7 to 8\nmove 19 from 8 to 2\nmove 1 from 9 to 6\nmove 5 from 3 to 7\nmove 2 from 6 to 7\nmove 1 from 3 to 9\nmove 2 from 3 to 6\nmove 4 from 2 to 6\nmove 6 from 2 to 4\nmove 14 from 7 to 9\nmove 8 from 2 to 5\nmove 19 from 9 to 3\nmove 6 from 4 to 1\nmove 6 from 1 to 4\nmove 4 from 4 to 3\nmove 10 from 7 to 6\nmove 1 from 6 to 4\nmove 22 from 3 to 1\nmove 5 from 1 to 6\nmove 5 from 5 to 8\nmove 1 from 7 to 4\nmove 1 from 2 to 3\nmove 15 from 6 to 9\nmove 3 from 8 to 4\nmove 2 from 3 to 1\nmove 6 from 9 to 1\nmove 1 from 3 to 9\nmove 1 from 3 to 1\nmove 1 from 5 to 9\nmove 1 from 7 to 1\nmove 1 from 8 to 2\nmove 6 from 9 to 2\nmove 2 from 9 to 1\nmove 3 from 6 to 3\nmove 2 from 9 to 5\nmove 1 from 6 to 7\nmove 2 from 2 to 7\nmove 3 from 3 to 5\nmove 1 from 8 to 9\nmove 7 from 4 to 7\nmove 1 from 6 to 3\nmove 2 from 9 to 5\nmove 10 from 1 to 5\nmove 19 from 1 to 8\nmove 9 from 7 to 1\nmove 1 from 3 to 5\nmove 2 from 2 to 4\nmove 2 from 2 to 6\nmove 2 from 6 to 4\nmove 7 from 1 to 7\nmove 3 from 7 to 3\nmove 2 from 4 to 1\nmove 3 from 3 to 4\nmove 1 from 2 to 4\nmove 2 from 4 to 1\nmove 2 from 4 to 8\nmove 20 from 8 to 2\nmove 1 from 8 to 3\nmove 4 from 7 to 8\nmove 14 from 2 to 6\nmove 3 from 1 to 2\nmove 2 from 1 to 7\nmove 1 from 4 to 6\nmove 1 from 1 to 5\nmove 4 from 2 to 8\nmove 3 from 7 to 6\nmove 1 from 4 to 6\nmove 2 from 7 to 9\nmove 1 from 2 to 6\nmove 1 from 3 to 1\nmove 3 from 5 to 8\nmove 1 from 1 to 4\nmove 2 from 9 to 5\nmove 4 from 6 to 7\nmove 1 from 4 to 1\nmove 1 from 8 to 5\nmove 1 from 7 to 6\nmove 1 from 2 to 9\nmove 2 from 7 to 1\nmove 1 from 1 to 3\nmove 1 from 7 to 2\nmove 4 from 2 to 7\nmove 1 from 1 to 3\nmove 2 from 3 to 2\nmove 9 from 8 to 3\nmove 1 from 8 to 6\nmove 2 from 7 to 3\nmove 1 from 7 to 4\nmove 1 from 9 to 7\nmove 1 from 7 to 2\nmove 2 from 2 to 8\nmove 6 from 5 to 2\nmove 5 from 3 to 7\nmove 1 from 4 to 7\nmove 3 from 7 to 1\nmove 11 from 5 to 8\nmove 2 from 1 to 6\nmove 2 from 1 to 8\nmove 2 from 5 to 9\nmove 1 from 7 to 2\nmove 2 from 5 to 4\nmove 17 from 6 to 7\nmove 1 from 4 to 1\nmove 1 from 1 to 7\nmove 1 from 6 to 5\nmove 1 from 6 to 2\nmove 9 from 2 to 5\nmove 1 from 6 to 7\nmove 9 from 7 to 4\nmove 3 from 7 to 8\nmove 3 from 3 to 4\nmove 8 from 7 to 9\nmove 11 from 8 to 1\nmove 1 from 4 to 3\nmove 1 from 7 to 4\nmove 9 from 9 to 4\nmove 5 from 1 to 7\nmove 8 from 5 to 1\nmove 3 from 3 to 4\nm" <> ...}
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```
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```elixir
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[crates, moves] = String.split(puzzle_input, "\n\n")
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moves =
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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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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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end)
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crates =
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crates
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|> String.split("\n")
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|> Enum.drop(-1)
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|> Enum.map(fn line ->
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line
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|> String.to_charlist()
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|> Enum.chunk_every(4)
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|> Enum.map(fn
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[?[, n, ?] | _] -> n
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_ -> nil
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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.with_index(1)
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|> Map.new(fn {v, k} -> {k, v} end)
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```
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<!-- livebook:{"output":true} -->
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```
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%{
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1 => 'NWFRZSMD',
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2 => 'SGQPW',
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3 => 'CJNFQVRW',
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4 => 'LDGCPZF',
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5 => 'SPT',
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6 => 'LRWFDH',
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7 => 'CDNZ',
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8 => 'QJSVFRNW',
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9 => 'VWZGSMR'
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}
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```
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```elixir
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defmodule Day05 do
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def move(%{count: count, from: from, to: to}, columns, reverse? \\ true) do
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{moved, columns} = Access.get_and_update(columns, from, &Enum.split(&1, count))
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moved = if reverse?, do: Enum.reverse(moved), else: moved
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Map.update!(columns, to, &(moved ++ &1))
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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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```
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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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```
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<!-- livebook:{"output":true} -->
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```
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'FWNSHLDNZ'
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```
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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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```
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<!-- livebook:{"output":true} -->
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```
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'RNRGDNFQG'
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```