diff --git a/Cargo.lock b/Cargo.lock
index ee1820c..42e4afb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5,3 +5,21 @@ version = 3
 [[package]]
 name = "AoC2022"
 version = "0.1.0"
+dependencies = [
+ "itertools",
+]
+
+[[package]]
+name = "either"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90e5c1c8368803113bf0c9584fc495a58b86dc8a29edbf8fe877d21d9507e797"
+
+[[package]]
+name = "itertools"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
+dependencies = [
+ "either",
+]
diff --git a/Cargo.toml b/Cargo.toml
index c75c95c..3419816 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+itertools = "0.10.5"
diff --git a/inputs/day4.txt b/inputs/day4.txt
new file mode 100644
index 0000000..8719d89
--- /dev/null
+++ b/inputs/day4.txt
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diff --git a/src/bin/day4.rs b/src/bin/day4.rs
new file mode 100644
index 0000000..4af5108
--- /dev/null
+++ b/src/bin/day4.rs
@@ -0,0 +1,53 @@
+use itertools::Itertools;
+use std::collections::HashSet;
+use std::error::Error;
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::vec::Vec;
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let file = File::open("inputs/day4.txt")?;
+    let lines = io::BufReader::new(file).lines().map(|l| l.unwrap());
+
+    let sections: Vec<((u32, u32), (u32, u32))> = lines
+        .map(|l| {
+            l.split(',')
+                .map(|p| {
+                    p.split('-')
+                        .map(|id| id.parse::<u32>().unwrap())
+                        .collect_tuple()
+                        .unwrap()
+                })
+                .collect_tuple()
+                .unwrap()
+        })
+        .collect();
+
+    let count1 = sections
+        .iter()
+        .map(|((a, b), (x, y))| {
+            if (a >= x && b <= y) || (x >= a && y <= b) {
+                1
+            } else {
+                0
+            }
+        })
+        .fold(0, |a, b| a + b);
+
+    println!("Answer Part1: {}", count1);
+
+    let count2 = sections
+        .iter()
+        .map(|((a, b), (x, y))| {
+            if (a <= x && x <= b) || (x <= a && a <= y) {
+                1
+            } else {
+                0
+            }
+        })
+        .fold(0, |a, b| a + b);
+
+    println!("Answer Part2: {}", count2);
+
+    Ok(())
+}