diff --git a/day4/Cargo.lock b/day4/Cargo.lock
new file mode 100644
index 0000000..ba800e1
--- /dev/null
+++ b/day4/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "advent_of_code_day4"
+version = "0.0.1"
diff --git a/day4/Cargo.toml b/day4/Cargo.toml
new file mode 100644
index 0000000..a79f33b
--- /dev/null
+++ b/day4/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "advent_of_code_day4"
+version = "0.0.1"
+authors = ["Peery"]
+edition = "2021"
+
+[dependencies]
diff --git a/day4/input/debug.lst b/day4/input/debug.lst
new file mode 100644
index 0000000..bb35171
--- /dev/null
+++ b/day4/input/debug.lst
@@ -0,0 +1 @@
+2-4,6-8
diff --git a/day4/input/example_sections.lst b/day4/input/example_sections.lst
new file mode 100644
index 0000000..99a66c5
--- /dev/null
+++ b/day4/input/example_sections.lst
@@ -0,0 +1,6 @@
+2-4,6-8
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\ No newline at end of file
diff --git a/day4/input/input.lst b/day4/input/input.lst
new file mode 100644
index 0000000..f1311b8
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diff --git a/day4/src/main.rs b/day4/src/main.rs
new file mode 100644
index 0000000..6e711ea
--- /dev/null
+++ b/day4/src/main.rs
@@ -0,0 +1,84 @@
+#![crate_name = "advent_of_code_day4"]
+
+//use std::env;
+use std::fs;
+use std::path::{Path};
+
+fn parse_sectors(input: &str) -> Vec<Vec<Vec<u32>>> {
+    /// Parse the given string for the sector starts and ends.
+    /// 
+    /// # Arguments
+    /// * `input` - A string directly read from the file
+    assert!(!input.is_empty());
+    let lines: Vec<&str> = input.split("\n").collect();
+
+    let mut sector_groups: Vec<Vec<Vec<u32>>> = Vec::new(); // <[<1,2,3>, <3,4,5>]>
+    for line in &lines { 
+        let secs_str: Vec<&str> = line.split(",").collect();  // splitting into sector ranges, ["1-3", "3-5"]
+        if secs_str.len() != 2 {
+            continue
+        }
+        let mut line_vector: Vec<Vec<u32>> = Vec::new();
+
+        // str_range_exp = "1-3"
+
+        let str_range_params: Vec<&str> = secs_str[0].split("-").collect();
+        let mut range: Vec<u32> = Vec::new();
+        for i in str_range_params[0].parse::<u32>().unwrap()..(str_range_params[1].parse::<u32>().unwrap()+1) {
+            range.push(i);
+        }
+        line_vector.push(range.clone());
+
+        let str_range_params: Vec<&str> = secs_str[1].split("-").collect();
+        let mut range: Vec<u32> = Vec::new();
+        for i in str_range_params[0].parse::<u32>().unwrap()..(str_range_params[1].parse::<u32>().unwrap()+1) {
+            range.push(i);
+        }
+        line_vector.push(range.clone());
+
+        sector_groups.push(line_vector);
+    }
+    //println!("My Ranges are: {:?}", sector_groups);
+
+    return sector_groups;
+}
+
+fn check_for_overlaps(pair: &Vec<Vec<u32>>) -> Vec<u32> {
+    /// Checks the given two lust of values for overlaps in each other.
+    /// If there are overlaps a vector of them is returned.
+    /// If not an empty array is returned
+    assert!(pair.len() == 2);
+
+    let mut overlaps: Vec<u32> = Vec::new();
+
+    for value in &pair[0] {
+        if pair[1].contains(value) {
+            overlaps.push(*value);
+        }
+    }
+
+    return overlaps;
+}
+
+fn main() {
+    let input_path = Path::new("./input/input.lst");
+    
+    let contents = fs::read_to_string(input_path).unwrap();
+    //println!("My given file: \n{}", contents);
+
+    let sector_pairs: Vec<Vec<Vec<u32>>> = parse_sectors(&contents);
+    let mut complete_overlap_count = 0;
+
+    for pair in &sector_pairs {
+        let overlaps: Vec<u32> = check_for_overlaps(&pair);
+        //println!("Overlap is: {:?}", overlaps);
+
+        if overlaps.len() == pair[0].len() || overlaps.len() == pair[1].len() {
+            println!("Found a complete overlap in the following pair: {:?}", pair);
+            complete_overlap_count += 1;
+        }
+    }
+
+    println!();
+    println!("Found {} pairs with complete overlaps!", complete_overlap_count);
+}
\ No newline at end of file