3 files changed, 365 insertions, 0 deletions

diff --git a/2015/rs/code/six/Cargo.toml b/2015/rs/code/six/Cargo.toml
new file mode 100644
index 0000000..8413a35
--- /dev/null
+++ b/2015/rs/code/six/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "six"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2015/rs/code/six/src/input.txt b/2015/rs/code/six/src/input.txt
new file mode 100644
index 0000000..c4357c6
--- /dev/null
+++ b/2015/rs/code/six/src/input.txt
@@ -0,0 +1,300 @@
+turn on 887,9 through 959,629
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+turn on 141,242 through 932,871
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+toggle 678,333 through 752,957
+toggle 393,804 through 510,976
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+turn off 33,572 through 978,590
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diff --git a/2015/rs/code/six/src/main.rs b/2015/rs/code/six/src/main.rs
new file mode 100644
index 0000000..6342cd9
--- /dev/null
+++ b/2015/rs/code/six/src/main.rs
@@ -0,0 +1,57 @@
+static INPUT: &'static str = include_str!("input.txt");
+
+#[derive(Debug)]
+enum LightCommand {
+  TurnOff,
+  TurnOn,
+  Toggle
+}
+
+fn main() {
+  let valueified = INPUT.split('\n').filter(|s| !s.is_empty()).map(|s| {
+    let mut rsplit = s.rsplit(' ');
+    let mut cd = rsplit.next().unwrap().split(',').map(str::parse::<usize>).map(Result::unwrap);
+    let mut ab = rsplit.nth(1).unwrap().split(',').map(str::parse::<usize>).map(Result::unwrap);
+    let ab = (ab.next().unwrap(), ab.next().unwrap());
+    let cd = (cd.next().unwrap(), cd.next().unwrap());
+    match &s[0..7] {
+      "turn on" => (LightCommand::TurnOn, ab,cd),
+      "toggle " => (LightCommand::Toggle, ab,cd),
+      "turn of" => (LightCommand::TurnOff, ab,cd),
+      _ => unreachable!()
+    }
+  });
+
+  let mut lights = vec![false; 1_000_000];
+  for (cmd, (x1, y1), (x2, y2)) in valueified.clone() {
+    use LightCommand::*;
+    for x in x1..=x2 {
+      for y in y1..=y2 {
+        match cmd {
+          TurnOff => { lights[x + y * 1000] = false; },
+          TurnOn => { lights[x + y * 1000] = true; },
+          Toggle => { lights[x + y * 1000] = !lights[x + y * 1000]; }
+        }
+      }
+    }
+  }
+  let light_count = lights.into_iter().filter(|a| *a).count();
+  println!("Lit light count: {light_count}");
+
+  let mut lights = vec![0u64; 1_000_000];
+  for (cmd, (x1, y1), (x2, y2)) in valueified {
+    use LightCommand::*;
+    for x in x1..=x2 {
+      for y in y1..=y2 {
+        match cmd {
+          TurnOff if lights[x + y * 1000] != 0 => { lights[x + y * 1000] -= 1; },
+          TurnOn => { lights[x + y * 1000] += 1; },
+          Toggle => { lights[x + y * 1000] += 2 },
+          _ => ()
+        }
+      }
+    }
+  }
+  let light_count = lights.into_iter().sum::<u64>();
+  println!("Lit light count(Ancient Nordic Elvish): {light_count}");
+}