From 341f1d3f44b034c9fb6102aaa7eb22fd42d502a8 Mon Sep 17 00:00:00 2001
From: Jens Meindertsma <mail@jensmeindertsma.com>
Date: Fri, 25 Apr 2025 11:38:39 +0200
Subject: [PATCH] Set up day 20

---
 Cargo.lock                        |  7 +++++++
 README.md                         |  2 +-
 puzzles/2015/2015-20/Cargo.toml   |  6 ++++++
 puzzles/2015/2015-20/input.txt    |  1 +
 puzzles/2015/2015-20/src/lib.rs   | 15 +++++++++++++++
 puzzles/2015/2015-20/src/main.rs  | 17 +++++++++++++++++
 puzzles/2015/2015-20/src/part1.rs |  3 +++
 7 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 puzzles/2015/2015-20/Cargo.toml
 create mode 100644 puzzles/2015/2015-20/input.txt
 create mode 100644 puzzles/2015/2015-20/src/lib.rs
 create mode 100644 puzzles/2015/2015-20/src/main.rs
 create mode 100644 puzzles/2015/2015-20/src/part1.rs

diff --git a/Cargo.lock b/Cargo.lock
index 85a0ee2..d658ce6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -403,6 +403,13 @@ dependencies = [
  "ornament",
 ]
 
+[[package]]
+name = "puzzle-2015-20"
+version = "0.0.0"
+dependencies = [
+ "ornament",
+]
+
 [[package]]
 name = "puzzle-template"
 version = "0.0.0"
diff --git a/README.md b/README.md
index 31995d5..fb988b1 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ Rust is kinda my thing, lol!
 | 17  | No Such Thing as Too Much                                       | ❌     | ❌     |
 | 18  | Like a GIF For Your Yard                                        | ❌     | ❌     |
 | 19  | Medicine for Rudolph                                            | ❌     | ❌     |
-| 20  | Infinite Elves and Infinite Houses                              | ❌     | ❌     |
+| 20  | [Infinite Elves and Infinite Houses](puzzles/2015/2015-20/)     | ❌     | ❌     |
 | 21  | RPG Simulator 20XX                                              | ❌     | ❌     |
 | 22  | Wizard Simulator 20XX                                           | ❌     | ❌     |
 | 23  | Opening the Turing Lock                                         | ❌     | ❌     |
diff --git a/puzzles/2015/2015-20/Cargo.toml b/puzzles/2015/2015-20/Cargo.toml
new file mode 100644
index 0000000..ade843c
--- /dev/null
+++ b/puzzles/2015/2015-20/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "puzzle-2015-20"
+edition = "2024"
+
+[dependencies]
+ornament.workspace = true
diff --git a/puzzles/2015/2015-20/input.txt b/puzzles/2015/2015-20/input.txt
new file mode 100644
index 0000000..282bc62
--- /dev/null
+++ b/puzzles/2015/2015-20/input.txt
@@ -0,0 +1 @@
+33100000
diff --git a/puzzles/2015/2015-20/src/lib.rs b/puzzles/2015/2015-20/src/lib.rs
new file mode 100644
index 0000000..bb564c2
--- /dev/null
+++ b/puzzles/2015/2015-20/src/lib.rs
@@ -0,0 +1,15 @@
+mod part1;
+
+pub use part1::part_1;
+
+#[cfg(test)]
+mod tests {
+    const INPUT: &str = include_str!("../input.txt");
+
+    #[test]
+    fn part_1() {
+        use super::part_1;
+
+        assert_eq!(part_1(INPUT), 776160);
+    }
+}
diff --git a/puzzles/2015/2015-20/src/main.rs b/puzzles/2015/2015-20/src/main.rs
new file mode 100644
index 0000000..3ef61fe
--- /dev/null
+++ b/puzzles/2015/2015-20/src/main.rs
@@ -0,0 +1,17 @@
+use ornament::{Puzzle, Solution};
+use puzzle_2015_20::part_1;
+
+fn main() {
+    Puzzle {
+        name: "Infinite Elves and Infinite Houses",
+        year: 2015,
+        day: 20,
+        part_1: |input| {
+            Solution::new(part_1, input, |answer| {
+                format!("{answer} is the lowest house number")
+            })
+        },
+        part_2: None,
+    }
+    .solve(include_str!("../input.txt"))
+}
diff --git a/puzzles/2015/2015-20/src/part1.rs b/puzzles/2015/2015-20/src/part1.rs
new file mode 100644
index 0000000..4cd8583
--- /dev/null
+++ b/puzzles/2015/2015-20/src/part1.rs
@@ -0,0 +1,3 @@
+pub fn part_1(input: &str) -> usize {
+    todo!()
+}