5 files changed, 59 insertions, 0 deletions
diff --git a/2015/rs/Cargo.lock b/2015/rs/Cargo.lock
index 5f198ba..9395ee8 100644
--- a/2015/rs/Cargo.lock
+++ b/2015/rs/Cargo.lock
@@ -89,6 +89,10 @@ name = "six"
 version = "0.1.0"
 
 [[package]]
+name = "ten"
+version = "0.1.0"
+
+[[package]]
 name = "three"
 version = "0.1.0"
 
diff --git a/2015/rs/base/Cargo.toml b/2015/rs/base/Cargo.toml
new file mode 100644
index 0000000..6916ddc
--- /dev/null
+++ b/2015/rs/base/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "base"
+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/base/src/main.rs b/2015/rs/base/src/main.rs
new file mode 100644
index 0000000..af03856
--- /dev/null
+++ b/2015/rs/base/src/main.rs
@@ -0,0 +1,5 @@
+static INPUT: &str = include_str!("input.txt");
+
+fn main() {
+  let valueified = INPUT;
+}
diff --git a/2015/rs/code/ten/Cargo.toml b/2015/rs/code/ten/Cargo.toml
new file mode 100644
index 0000000..c39e57b
--- /dev/null
+++ b/2015/rs/code/ten/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "ten"
+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/ten/src/main.rs b/2015/rs/code/ten/src/main.rs
new file mode 100644
index 0000000..848c288
--- /dev/null
+++ b/2015/rs/code/ten/src/main.rs
@@ -0,0 +1,34 @@
+use std::fmt::Write;
+
+static INPUT: &str = "1113122113";
+
+fn main() {
+  let mut buf = INPUT.to_string();
+  for _ in 0..40 {
+    buf = part1(&buf);
+  }
+  println!("Final strlen @ 40: {}", buf.len());
+
+  for _ in 0..10 {
+    buf = part1(&buf);
+  }
+  println!("Final strlen @ 50: {}", buf.len());
+}
+
+fn part1(nums: &str) -> String {
+  let mut buf = String::with_capacity(nums.len() * 2); // worst-case
+  let mut chars = nums.chars();
+  let mut last = chars.next().unwrap();
+  let mut count = 1;
+  for char in chars {
+    if char == last {
+      count += 1;
+    } else {
+      let _ = write!(&mut buf, "{count}{last}");
+      last = char;
+      count = 1;
+    }
+  }
+  let _ = write!(&mut buf, "{count}{last}");
+  buf
+}