diff --git a/day-11/Cargo.lock b/day-11/Cargo.lock
new file mode 100644
index 0000000..edc61df
--- /dev/null
+++ b/day-11/Cargo.lock
@@ -0,0 +1,141 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
+name = "day-11"
+version = "0.1.0"
+dependencies = [
+ "indoc",
+ "ndarray",
+]
+
+[[package]]
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+checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
+dependencies = [
+ "indoc-impl",
+ "proc-macro-hack",
+]
+
+[[package]]
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+checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0"
+dependencies = [
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "unindent",
+]
+
+[[package]]
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+ "matrixmultiply",
+ "num-complex",
+ "num-integer",
+ "num-traits",
+ "rawpointer",
+]
+
+[[package]]
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+ "num-traits",
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+[[package]]
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+checksum = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
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+ "num-traits",
+]
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+[[package]]
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+ "autocfg",
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+[[package]]
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+[[package]]
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+ "unicode-xid",
+]
+
+[[package]]
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+ "proc-macro2",
+]
+
+[[package]]
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+checksum = "60a357793950651c4ed0f3f52338f53b2f809f32d83a07f72909fa13e4c6c1e3"
+
+[[package]]
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+checksum = "9a2af957a63d6bd42255c359c93d9bfdb97076bd3b820897ce55ffbfbf107f44"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "unindent"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/day-11/Cargo.toml b/day-11/Cargo.toml
new file mode 100644
index 0000000..1a7f7d8
--- /dev/null
+++ b/day-11/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "day-11"
+version = "0.1.0"
+authors = ["Tristan Daniël Maat <tm@tlater.net>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+indoc = "0.3"
+ndarray = "0.14"
diff --git a/day-11/input b/day-11/input
new file mode 100644
index 0000000..7cf41d9
--- /dev/null
+++ b/day-11/input
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diff --git a/day-11/src/main.rs b/day-11/src/main.rs
new file mode 100644
index 0000000..cc2c6ac
--- /dev/null
+++ b/day-11/src/main.rs
@@ -0,0 +1,121 @@
+use std::fs;
+use std::iter;
+
+use ndarray::Array2;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+ let input = fs::read_to_string("input")?;
+ let layout = parse_layout(&input)?;
+
+ // Part 1
+ let result = count_with_neighboring_seats(&layout);
+ println!("{}", result);
+
+ // Part 2
+ let result = count_with_directional_seats(&layout);
+ println!("{}", result);
+
+ Ok(())
+}
+
+type Layout = Array2<Seating>;
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+enum Seating {
+ Occupied,
+ Empty,
+ Floor,
+}
+
+impl Seating {
+ fn new(symbol: char) -> Result<Self, String> {
+ match symbol {
+ '#' => Ok(Seating::Occupied),
+ 'L' => Ok(Seating::Empty),
+ '.' => Ok(Seating::Floor),
+ rubbish => Err(format!("Found some rubbish on the floor, area must be clean to conserve human behavior: {}", rubbish))
+ }
+ }
+}
+
+fn parse_layout(input: &str) -> Result<Layout, String> {
+ let (i, j) = (
+ input.lines().count(),
+ input.lines().next().ok_or("Waiting room too small")?.len(),
+ );
+
+ // Padding the input data so that we can later comfortably produce
+ // a convolution
+
+ let grid = input
+ .lines()
+ .flat_map(|line| {
+ iter::once(Ok(Seating::Floor))
+ .chain(line.chars().map(Seating::new))
+ .chain(iter::once(Ok(Seating::Floor)))
+ })
+ .collect::<Result<Vec<Seating>, String>>()?;
+
+ Array2::from_shape_vec((i, j), grid)
+ .map_err(|_| "Non-square waiting rooms don't exist".to_string())
+}
+
+fn count_with_neighboring_seats(layout: &Layout) -> usize {
+ unimplemented!()
+}
+
+fn count_with_directional_seats(layout: &Layout) -> usize {
+ unimplemented!()
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use indoc::indoc;
+
+ #[test]
+ fn test_simple() -> Result<(), Box<dyn std::error::Error>> {
+ let input = indoc!(
+ "L.LL.LL.LL
+ LLLLLLL.LL
+ L.L.L..L..
+ LLLL.LL.LL
+ L.LL.LL.LL
+ L.LLLLL.LL
+ ..L.L.....
+ LLLLLLLLLL
+ L.LLLLLL.L
+ L.LLLLL.LL
+ "
+ );
+
+ let layout = parse_layout(&input)?;
+ let result = count_with_neighboring_seats(&layout);
+
+ assert_eq!(result, 37);
+ Ok(())
+ }
+
+ #[test]
+ fn test_simple2() -> Result<(), Box<dyn std::error::Error>> {
+ let input = indoc!(
+ "L.LL.LL.LL
+ LLLLLLL.LL
+ L.L.L..L..
+ LLLL.LL.LL
+ L.LL.LL.LL
+ L.LLLLL.LL
+ ..L.L.....
+ LLLLLLLLLL
+ L.LLLLLL.L
+ L.LLLLL.LL
+ "
+ );
+
+ let layout = parse_layout(&input)?;
+ let result = count_with_directional_seats(&layout);
+
+ assert_eq!(result, 37);
+ Ok(())
+ }
+}