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hauleth.dev
1# Day 12
2
3```elixir
4Mix.install([:kino_aoc])
5```
6
7## Parsing
8
9<!-- livebook:{"attrs":"eyJhc3NpZ25fdG8iOiJwdXp6bGVfaW5wdXQiLCJkYXkiOiIxMiIsInNlc3Npb25fc2VjcmV0IjoiQURWRU5UX09GX0NPREVfU0VTU0lPTiIsInllYXIiOiIyMDI1In0","chunks":null,"kind":"Elixir.KinoAOC.HelperCell","livebook_object":"smart_cell"} -->
10
11```elixir
12{:ok, puzzle_input} =
13 KinoAOC.download_puzzle("2025", "12", System.fetch_env!("LB_ADVENT_OF_CODE_SESSION"))
14```
15
16```elixir
17{areas, boxes} =
18 puzzle_input
19 |> String.split("\n\n")
20 |> List.pop_at(-1)
21```
22
23```elixir
24areas =
25 areas
26 |> String.split("\n")
27 |> Enum.map(fn raw ->
28 [area | counts] = String.split(raw)
29
30 area =
31 area
32 |> String.trim(":")
33 |> String.split("x")
34 |> Enum.map(&String.to_integer/1)
35 |> Enum.product()
36
37 counts = Enum.map(counts, &String.to_integer/1)
38
39 {area, counts}
40 end)
41```
42
43```elixir
44boxes =
45 boxes
46 |> Enum.map(fn <<_::binary-3>> <> rest ->
47 rest
48 |> String.to_charlist()
49 |> Enum.count(&(&1 == ?#))
50 end)
51```
52
53<!-- livebook:{"branch_parent_index":0} -->
54
55## Part 1
56
57```elixir
58areas
59|> Enum.count(fn {max, counts} ->
60 counts
61 |> Enum.zip_with(boxes, &*/2)
62 |> Enum.sum()
63 |> then(& &1 <= max)
64end)
65```
66
67<!-- livebook:{"branch_parent_index":0} -->
68
69## Part 2
70
71FIN
72
73<!-- livebook:{"offset":1266,"stamp":{"token":"XCP.VAO97d30rTEs0AWIHkPD4J0fLm3S60tQ3fKoA-riReFbzMnqL1jIoxttGhvNSnCfZVNfeUBuSYVe6PrIshxVGBwjr3pjNHCyFLSb4iSPNh277lkMmh6Gtrlfr8dvsYvw0g","version":2}} -->