diff --git a/day11/Cargo.lock b/day11/Cargo.lock
new file mode 100644
index 0000000..4f31108
--- /dev/null
+++ b/day11/Cargo.lock
@@ -0,0 +1,119 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
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+dependencies = [
+ "cfg-if",
+ "getrandom",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
+[[package]]
+name = "cfg-if"
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+ "ahash",
+]
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+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
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+ "zerocopy-derive",
+]
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/day11/Cargo.toml b/day11/Cargo.toml
new file mode 100644
index 0000000..a636639
--- /dev/null
+++ b/day11/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "day11"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+ahash = "0.8.11"
diff --git a/day11/src/main.rs b/day11/src/main.rs
new file mode 100644
index 0000000..d954bd3
--- /dev/null
+++ b/day11/src/main.rs
@@ -0,0 +1,54 @@
+use ahash::AHashMap;
+
+fn parse(input: &str) -> Vec<usize> {
+    input
+        .split_whitespace()
+        .map(|n| n.parse().unwrap())
+        .collect()
+}
+
+fn split_number(num: &usize) -> (usize, usize) {
+    let mut digit_count = 0;
+    let mut rest = *num;
+    while rest > 0 {
+        rest /= 10;
+        digit_count += 1;
+    }
+    let divisor = 10usize.pow(digit_count / 2);
+    (num % divisor, num / divisor)
+}
+
+fn get_amount(num: &usize, steps: &usize, cache: &mut AHashMap<(usize, usize), usize>) -> usize {
+    if let Some(val) = cache.get(&(*num, *steps)) {
+        return *val;
+    }
+    if steps == &0 {
+        return 1;
+    }
+    let mut res = 0;
+    if num == &0 {
+        res += get_amount(&1, &(steps - 1), cache);
+    } else if num.to_string().chars().count() % 2 == 0 {
+        let (splitl, splitr) = split_number(num);
+        res += get_amount(&splitl, &(steps - 1), cache);
+        res += get_amount(&splitr, &(steps - 1), cache);
+    } else {
+        res += get_amount(&(num * 2024), &(steps - 1), cache);
+    }
+    cache.insert((*num, *steps), res);
+    res
+}
+
+fn part(input: &[usize], steps: usize) -> usize {
+    let mut cache = AHashMap::new();
+    input
+        .iter()
+        .map(|n| get_amount(n, &steps, &mut cache))
+        .sum()
+}
+
+fn main() {
+    let input = parse(include_str!("../input.txt"));
+    println!("{}", part(&input, 25));
+    println!("{}", part(&input, 75));
+}