From 3e21b24509ccccc07d8b04f5b25f31c14b599f12 Mon Sep 17 00:00:00 2001
From: Sloane Perrault <sloane.perrault@gmail.com>
Date: Wed, 21 Sep 2022 09:19:53 -0400
Subject: [PATCH] solve 2015 day 10
---
2015/README.md | 5 ++++-
2015/lib/2015/10.ex | 33 +++++++++++++++++++++++++++++++++
README.md | 6 ++++++
3 files changed, 43 insertions(+), 1 deletion(-)
create mode 100644 2015/lib/2015/10.ex
diff --git a/2015/README.md b/2015/README.md
index 3341f6a..bcb8be2 100644
--- a/2015/README.md
+++ b/2015/README.md
@@ -15,7 +15,7 @@
| S | M | T | W | T | F | S |
| :-: | :-: | :-: | :-: | :-: | :-: | :-: |
| | | [1] | [2] | [3] | [4] | [5] |
-| [6] | [7] | 8 | 9 | 10 | 11 | 12 |
+| [6] | [7] | [8] | [9] | [10]| 11 | 12 |
| 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| 20 | 21 | 22 | 23 | 24 | 25 | |
@@ -26,3 +26,6 @@
[5]: ./lib/2015/5.ex
[6]: ./lib/2015/6.ex
[7]: ./lib/2015/7.ex
+[8]: ./lib/2015/8.ex
+[9]: ./lib/2015/9.ex
+[10]: ./lib/2015/10.ex
diff --git a/2015/lib/2015/10.ex b/2015/lib/2015/10.ex
new file mode 100644
index 0000000..cf80c57
--- /dev/null
+++ b/2015/lib/2015/10.ex
@@ -0,0 +1,33 @@
+import AOC
+
+aoc 2015, 10 do
+ def look_and_say(s) when is_binary(s),
+ do:
+ String.to_integer(s)
+ |> Integer.digits()
+ |> look_and_say()
+ |> IO.iodata_to_binary()
+
+ def look_and_say([x | xs]), do: look_and_say(xs, {x, 1})
+ def look_and_say([x | xs], {x, c}), do: look_and_say(xs, {x, c + 1})
+ def look_and_say([x | xs], state), do: [look_and_say([], state), look_and_say(xs, {x, 1})]
+ def look_and_say([], {x, c}), do: [Integer.to_string(c), Integer.to_string(x)]
+
+ def p1 do
+ Enum.reduce(1..40, String.trim(input_string()), fn iteration, acc ->
+ IO.puts("#{iteration / 40 * 100}%")
+
+ look_and_say(acc)
+ end)
+ |> String.length()
+ end
+
+ def p2 do
+ Enum.reduce(1..50, String.trim(input_string()), fn iteration, acc ->
+ IO.puts("#{iteration / 50 * 100}%")
+
+ look_and_say(acc)
+ end)
+ |> String.length()
+ end
+end
diff --git a/README.md b/README.md
index 6341bfb..0ebd672 100644
--- a/README.md
+++ b/README.md
@@ -6,8 +6,14 @@
## Years
+1. [2015]
+1. 2016
+1. 2017
+1. 2018
+1. 2019
1. [2020]
1. [2021]
+[2015]: ./2015
[2020]: ./2020
[2021]: ./2021