adventofcode

commit: d54a4164b3a23faf48d61643c7007164d1b2a9b9
parent: 5e085cd22976cc01bf10ecbb1a2d1e801fdf2618
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Mon,  2 Dec 2019 13:57:11 +0100

day2: part two

Diffstat:
M
lib/day2.ex
5
+++++
A
scripts/day2_2.ex
40
++++++++++++++++++++++++++++++++++++++++

2 files changed, 45 insertions(+), 0 deletions(-)
diff --git a/lib/day2.ex b/lib/day2.ex
@@ -13,4 +13,9 @@ defmodule Day2 do
   def opcode([99, _, _, _], _) do
     :halt
   end
+
+  # noop
+  def opcode(_, _) do
+    :noop
+  end
 end
diff --git a/scripts/day2_2.ex b/scripts/day2_2.ex
@@ -0,0 +1,40 @@
+line =
+  "1,1,2,3,1,1,2,3,1,3,4,3,1,5,0,3,2,10,1,19,1,6,19,23,1,23,13,27,2,6,27,31,1,5,31,35,2,10,35,39,1,6,39,43,1,13,43,47,2,47,6,51,1,51,5,55,1,55,6,59,2,59,10,63,1,63,6,67,2,67,10,71,1,71,9,75,2,75,10,79,1,79,5,83,2,10,83,87,1,87,6,91,2,9,91,95,1,95,5,99,1,5,99,103,1,103,10,107,1,9,107,111,1,6,111,115,1,115,5,119,1,10,119,123,2,6,123,127,2,127,6,131,1,131,2,135,1,10,135,0,99,2,0,14,0"
+
+{:ok, agent} = Agent.start_link(fn -> [] end)
+
+Enum.each(0..99, fn n ->
+  Enum.each(0..99, fn v ->
+    IO.puts("noun=" <> Integer.to_string(n) <> ", verb=" <> Integer.to_string(v))
+
+    Agent.update(agent, fn _ ->
+      line
+      |> String.split([" ", ",", "\n"])
+      |> Enum.map(&String.to_integer(&1))
+      |> List.replace_at(1, n)
+      |> List.replace_at(2, v)
+    end)
+
+    Agent.get(agent, & &1)
+    |> Enum.chunk_every(4)
+    |> Enum.each(fn opcode ->
+      result =
+        opcode
+        |> Day2.opcode(Agent.get(agent, & &1))
+
+      if :halt == result do
+        if 19_690_720 == Enum.at(Agent.get(agent, & &1), 0) do
+          IO.puts(
+            "100*" <>
+              Integer.to_string(n) <>
+              "+" <> Integer.to_string(v) <> "=" <> Integer.to_string(100 * n + v)
+          )
+
+          exit(:normal)
+        end
+      else
+        Agent.update(agent, fn _ -> result end)
+      end
+    end)
+  end)
+end)