diff --git a/Cargo.lock b/Cargo.lock
index b51871d..fb1fc33 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -73,6 +73,7 @@ version = "0.1.0"
 dependencies = [
  "clap",
  "color-eyre",
+ "itertools",
 ]
 
 [[package]]
@@ -169,6 +170,12 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b05b61dc5112cbb17e4b6cd61790d9845d13888356391624cbe7e41efeac1e75"
 
+[[package]]
+name = "either"
+version = "1.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"
+
 [[package]]
 name = "eyre"
 version = "0.6.12"
@@ -203,6 +210,15 @@ version = "1.70.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a6cb138bb79a146c1bd460005623e142ef0181e3d0219cb493e02f7d08a35695"
 
+[[package]]
+name = "itertools"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b192c782037fadd9cfa75548310488aabdbf3d2da73885b31bd0abd03351285"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "lazy_static"
 version = "1.5.0"
diff --git a/Cargo.toml b/Cargo.toml
index 29c228c..2491122 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,4 @@ edition = "2024"
 [dependencies]
 clap = { version = "4.5.53", features = ["derive"] }
 color-eyre = "0.6.5"
+itertools = "0.14.0"
diff --git a/src/solutions/day_02.rs b/src/solutions/day_02.rs
index 0bb7a38..6670ef1 100644
--- a/src/solutions/day_02.rs
+++ b/src/solutions/day_02.rs
@@ -1,3 +1,7 @@
+use std::io::Write;
+
+use itertools::Itertools;
+
 use crate::solution::Solution;
 
 #[derive(Clone, Copy, Debug)]
@@ -18,17 +22,39 @@ impl IdRange {
 struct Id(u64);
 
 impl Id {
-    fn contains_repeat(&self) -> bool {
-        let s = self.0.to_string();
+    fn contains_double_repeat(&self, buf: &mut Vec<u8>) -> bool {
+        buf.clear();
+        write!(buf, "{}", self.0).unwrap();
 
-        if !s.len().is_multiple_of(2) {
+        if !buf.len().is_multiple_of(2) {
             return false;
         }
 
-        let (left, right) = s.split_at(s.len() / 2);
+        let (left, right) = buf.split_at(buf.len() / 2);
 
         left == right
     }
+
+    fn contains_any_repeat(&self, buf: &mut Vec<u8>) -> bool {
+        if self.contains_double_repeat(buf) {
+            return true;
+        }
+
+        buf.clear();
+        write!(buf, "{}", self.0).unwrap();
+
+        for num_parts in 2..=buf.len() {
+            if !buf.len().is_multiple_of(num_parts) {
+                continue;
+            }
+
+            if buf.chunks_exact(buf.len() / num_parts).all_equal() {
+                return true;
+            }
+        }
+
+        false
+    }
 }
 
 #[derive(Debug)]
@@ -43,10 +69,22 @@ impl Solution for Day02 {
     }
 
     fn part1(&self) -> String {
+        let mut buf = Vec::with_capacity(10);
+
+        self.ranges
+            .iter()
+            .flat_map(IdRange::ids)
+            .filter_map(|id| id.contains_double_repeat(&mut buf).then_some(id.0))
+            .sum::<u64>()
+            .to_string()
+    }
+
+    fn part2(&self) -> String {
+        let mut buf = Vec::with_capacity(10);
         self.ranges
             .iter()
             .flat_map(IdRange::ids)
-            .filter_map(|id| id.contains_repeat().then_some(id.0))
+            .filter_map(|id| id.contains_any_repeat(&mut buf).then_some(id.0))
             .sum::<u64>()
             .to_string()
     }