From 407453790f86c7bc227e8b243ab273fd48b85e2f Mon Sep 17 00:00:00 2001
From: sloane <1699281+sloanelybutsurely@users.noreply.github.com>
Date: Mon, 11 Dec 2023 13:19:14 -0500
Subject: [PATCH] solve 2015 19.1
---
2015/.envrc | 2 +-
2015/.tool-versions | 4 ++--
2015/README.md | 3 ++-
2015/lib/2015/19.ex | 34 ++++++++++++++++++----------------
README.md | 2 +-
5 files changed, 24 insertions(+), 21 deletions(-)
diff --git a/2015/.envrc b/2015/.envrc
index e24737b..24bb1b6 100644
--- a/2015/.envrc
+++ b/2015/.envrc
@@ -1 +1 @@
-export ADVENT_OF_CODE_SESSION=53616c7465645f5f92dfbc249005a7e94ec3c6e62cd4e5e9ddf8e368a48c0c80440b6c5e37d836cc0b294e19a9e8a7f1
+export ADVENT_OF_CODE_SESSION=53616c7465645f5f18112545c7b5290961cf3f2c965e90c1b68415326ef1f99790e4dde4ef0cebc7abd120ea1b537aada76420516a0ceb883a722a84b81e7a02
diff --git a/2015/.tool-versions b/2015/.tool-versions
index eda65d9..ff52406 100644
--- a/2015/.tool-versions
+++ b/2015/.tool-versions
@@ -1,2 +1,2 @@
-erlang 24.1.4
-elixir 1.12.3-otp-24
+erlang 26.1.2
+elixir 1.15.7-otp-26
diff --git a/2015/README.md b/2015/README.md
index d8143d1..6574c8c 100644
--- a/2015/README.md
+++ b/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
@@ -37,3 +37,4 @@
[16]: ./lib/2015/16.ex
[17]: ./lib/2015/17.ex
[18]: ./lib/2015/18.ex
+[19]: ./lib/2015/19.ex
diff --git a/2015/lib/2015/19.ex b/2015/lib/2015/19.ex
index 4651a4c..bb53976 100644
--- a/2015/lib/2015/19.ex
+++ b/2015/lib/2015/19.ex
@@ -18,25 +18,27 @@ aoc 2015, 19 do
{replacement_mappings, starting_molecule}
end
- def splits(xs) do
- for i <- 1..(length(xs) - 1) do
- Enum.split(xs, i)
- end
+ def possible_substitutions("", _, _), do: []
+
+ def possible_substitutions(str, source, replacement) do
+ <<curr::binary-size(1), next::binary>> = str
+
+ this =
+ if String.starts_with?(str, source),
+ do: [String.replace(str, source, replacement, global: false)],
+ else: []
+
+ this ++ for r <- possible_substitutions(next, source, replacement), do: curr <> r
end
- def possible_replacements(mappings, str) do
- for {source, replacements} <- mappings,
- replacement <- replacements,
- {l, r} <- splits(String.split(str, source)),
- uniq: true do
- Enum.join(
- [
- Enum.join(l, source),
- Enum.join(r, source)
- ],
- replacement
- )
+ def possible_replacements(mappings, molecule) do
+ for {source, replacements} <- mappings, replacement <- replacements do
+ {source, replacement}
end
+ |> Enum.flat_map(fn {source, replacement} ->
+ possible_substitutions(molecule, source, replacement)
+ end)
+ |> Enum.uniq()
end
def p1 do
diff --git a/README.md b/README.md
index 307b285..bbf2052 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
## Years
-1. [2015] **36/50** 🌟
+1. [2015] **37/50** 🌟
1. 2016
1. [2017] **18/50** 🌟
1. 2018