From bcd24674ec0a594882b276fd48fe70c6e3d7ec86 Mon Sep 17 00:00:00 2001
From: Tomasz Chojnacki <tomaszchojnacki2001@gmail.com>
Date: Thu, 6 Apr 2023 11:47:33 +0200
Subject: Finish day 11

---
 aoc-2020-gleam/src/util/pos.gleam | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 aoc-2020-gleam/src/util/pos.gleam

(limited to 'aoc-2020-gleam/src/util')

diff --git a/aoc-2020-gleam/src/util/pos.gleam b/aoc-2020-gleam/src/util/pos.gleam
new file mode 100644
index 0000000..a060440
--- /dev/null
+++ b/aoc-2020-gleam/src/util/pos.gleam
@@ -0,0 +1,26 @@
+import gleam/list
+import gleam/set.{Set}
+
+pub type Pos =
+  #(Int, Int)
+
+pub const directions8 = [
+  #(1, 0),
+  #(1, 1),
+  #(0, 1),
+  #(-1, 1),
+  #(-1, 0),
+  #(-1, -1),
+  #(0, -1),
+  #(1, -1),
+]
+
+pub fn add(p1: Pos, p2: Pos) -> Pos {
+  #(p1.0 + p2.0, p1.1 + p2.1)
+}
+
+pub fn neighbours8(pos: Pos) -> Set(Pos) {
+  directions8
+  |> list.map(with: add(pos, _))
+  |> set.from_list
+}
-- 
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