2015 day 16

2015/README.md

@@ -16,7 +16,7 @@
 | :--: | :--: | :-:  | :-: | :-:  | :-:  | :-:  |
 |      |      | [1]  | [2] | [3]  | [4]  | [5]  |
 |  [6] | [7]  | [8]  | [9] | [10] | [11] | [12] |
-| [13] | [14] | [15] | 16  | 17   | 18   | 19   |
+| [13] | [14] | [15] | [16]| 17   | 18   | 19   |
 |  20  | 21   | 22   | 23  | 24   | 25   |      |
 
 [1]: ./lib/2015/1.ex
@@ -34,3 +34,4 @@
 [13]: ./lib/2015/13.ex
 [14]: ./lib/2015/14.ex
 [15]: ./lib/2015/15.ex
+[16]: ./lib/2015/16.ex

2015/lib/2015/16.ex

@@ -0,0 +1,79 @@
+import AOC
+
+aoc 2015, 16 do
+  @moduledoc """
+      children: 3
+      cats: 7
+      samoyeds: 2
+      pomeranians: 3
+      akitas: 0
+      vizslas: 0
+      goldfish: 5
+      trees: 3
+      cars: 2
+      perfumes: 1
+  """
+
+  def known_properties() do
+    """
+    children: 3
+    cats: 7
+    samoyeds: 2
+    pomeranians: 3
+    akitas: 0
+    vizslas: 0
+    goldfish: 5
+    trees: 3
+    cars: 2
+    perfumes: 1
+    """
+    |> String.split("\n", trim: true)
+    |> Enum.map(&String.split(&1, ": "))
+    |> Enum.map(fn [l, v] -> {l, String.to_integer(v)} end)
+  end
+
+  def get_value(sue, label) do
+    [value] = Regex.run(~r/#{label}: (\d+)/, sue, capture: :all_but_first)
+    value |> String.to_integer()
+  end
+
+  def p1 do
+    input_stream()
+    |> Stream.filter(fn sue ->
+      known_properties()
+      |> Enum.filter(fn {label, _} -> String.contains?(sue, label) end)
+      |> Enum.all?(fn {label, value} ->
+        if String.contains?(sue, label) do
+          String.contains?(sue, "#{label}: #{value}")
+        else
+          true
+        end
+      end)
+    end)
+    |> Stream.take(1)
+    |> Enum.to_list()
+    |> hd()
+  end
+
+  def p2 do
+    input_stream()
+    |> Stream.filter(fn sue ->
+      known_properties()
+      |> Enum.filter(fn {label, _} -> String.contains?(sue, label) end)
+      |> Enum.all?(fn
+        {label, value} when label in ~w[cats trees] ->
+          IO.inspect(label, label: "label")
+          IO.inspect(value, label: "value")
+          IO.inspect(get_value(sue, label), label: "get_value(sue, label)")
+          value < get_value(sue, label)
+
+        {label, value} when label in ~w[goldfish pomeranians] ->
+          value > get_value(sue, label)
+
+        {label, value} ->
+          String.contains?(sue, "#{label}: #{value}")
+      end)
+    end)
+    |> Enum.to_list()
+  end
+end