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new file mode 100644
index 0000000..94e880d
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+++ b/closest_string/Cargo.lock
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diff --git a/closest_string/Cargo.toml b/closest_string/Cargo.toml
new file mode 100644
index 0000000..17a0c76
--- /dev/null
+++ b/closest_string/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "closest_string"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4.5.21", features = ["derive"] }
diff --git a/closest_string/cs0.out b/closest_string/cs0.out
new file mode 100644
index 0000000..768138b
--- /dev/null
+++ b/closest_string/cs0.out
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diff --git a/closest_string/cs1.out b/closest_string/cs1.out
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diff --git a/closest_string/cs2.out b/closest_string/cs2.out
new file mode 100644
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--- /dev/null
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diff --git a/closest_string/cs3.out b/closest_string/cs3.out
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diff --git a/closest_string/cs4.out b/closest_string/cs4.out
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diff --git a/closest_string/src/main.rs b/closest_string/src/main.rs
new file mode 100644
index 0000000..13c4429
--- /dev/null
+++ b/closest_string/src/main.rs
@@ -0,0 +1,122 @@
+use std::path::{Path, PathBuf};
+
+use clap::{Parser, ValueEnum};
+
+fn read_input(filename: impl AsRef<Path>) -> Vec<Vec<u8>> {
+    let text = std::fs::read_to_string(filename).unwrap();
+
+    let mut r = Vec::new();
+
+    for line in text.lines().skip(1) {
+        r.push(line.as_bytes().to_vec());
+    }
+
+    r
+}
+
+fn calculate_hamming_distance(a: &[u8], b: &[u8]) -> usize {
+    a.iter().zip(b.iter()).filter(|(a, b)| a != b).count()
+}
+
+fn simple<'a>(
+    strings: &[Vec<u8>],
+    solution: &'a mut [u8],
+    d: usize,
+    depth: usize,
+) -> Option<&'a [u8]> {
+    let (s, i) = strings
+        .iter()
+        .map(|s| (s, calculate_hamming_distance(s, solution)))
+        .max_by_key(|(_, i)| *i)
+        .unwrap();
+
+    if i > d + depth {
+        return None;
+    } else if i <= d {
+        return Some(solution);
+    }
+
+    for index in 0..s.len() {
+        if s[index] != solution[index] {
+            let temp = solution[index];
+            solution[index] = s[index];
+            simple(strings, solution, d, depth + 1)?;
+            solution[index] = temp;
+        }
+    }
+
+    None
+}
+
+fn closest_string(strings: &[Vec<u8>], d: usize, method: Method) -> Option<Vec<u8>> {
+    match method {
+        Method::Simple => {
+            let mut s = strings[0].clone();
+
+            if simple(strings, &mut s, d, 0).is_some() {
+                Some(s)
+            } else {
+                None
+            }
+        }
+    }
+}
+
+#[derive(ValueEnum, Debug, Clone, Copy)]
+enum Method {
+    Simple,
+}
+
+#[derive(Debug, Parser)]
+struct Args {
+    filename: PathBuf,
+    d: Option<usize>,
+    #[clap(default_value = "simple")]
+    method: Method,
+    #[clap(short, long)]
+    reverse: bool,
+}
+
+fn main() {
+    let total_start = std::time::Instant::now();
+    let args = Args::parse();
+
+    let strings = read_input(args.filename);
+
+    let result = if let Some(d) = args.d {
+        let start = std::time::Instant::now();
+        let r = closest_string(&strings, d, args.method);
+        eprintln!("{}: {:?}", d, start.elapsed());
+        r
+    } else if args.reverse {
+        let mut d = strings.len();
+        let mut last_solution = None;
+        loop {
+            let start = std::time::Instant::now();
+            let r = closest_string(&strings, d, args.method);
+            eprintln!("{}: {:?}", d, start.elapsed());
+            if let Some(r) = r {
+                d = r.len() - 1;
+                last_solution = Some(r);
+            } else {
+                break last_solution;
+            };
+        }
+    } else {
+        let mut d = 0;
+        loop {
+            let start = std::time::Instant::now();
+            let r = closest_string(&strings, d, args.method);
+            eprintln!("{}: {:?}", d, start.elapsed());
+            if let Some(r) = r {
+                break Some(r);
+            }
+            d += 1;
+        }
+    };
+
+    if let Some(solution) = result {
+        println!("{}", String::from_utf8(solution).unwrap());
+    }
+    eprintln!("Total time: {:?}", total_start.elapsed());
+}
diff --git a/closest_string/string0.in b/closest_string/string0.in
new file mode 100644
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--- /dev/null
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diff --git a/closest_string/string1.in b/closest_string/string1.in
new file mode 100644
index 0000000..0b0888b
--- /dev/null
+++ b/closest_string/string1.in
@@ -0,0 +1,1001 @@
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diff --git a/closest_string/string2.in b/closest_string/string2.in
new file mode 100644
index 0000000..dff9f22
--- /dev/null
+++ b/closest_string/string2.in
@@ -0,0 +1,1001 @@
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diff --git a/closest_string/string3.in b/closest_string/string3.in
new file mode 100644
index 0000000..83bd980
--- /dev/null
+++ b/closest_string/string3.in
@@ -0,0 +1,1001 @@
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diff --git a/closest_string/string4.in b/closest_string/string4.in
new file mode 100644
index 0000000..d0e0faf
--- /dev/null
+++ b/closest_string/string4.in
@@ -0,0 +1,1001 @@
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diff --git a/closest_string/validator.py b/closest_string/validator.py
new file mode 100755
index 0000000..ea4ae5c
--- /dev/null
+++ b/closest_string/validator.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+"""
+    usage: python3 validator.py path/to/input path/to/vertex/output
+"""
+
+import sys
+
+input_file = open(sys.argv[1], "r")
+
+sol_file = open(sys.argv[2], "r")
+
+n = int(input_file.readline().strip())
+strings = [l.strip() for l in input_file.readlines()[1:]]
+
+s = sol_file.readline().strip()
+
+if len(s) != len(strings[0]):
+    print("Lengths of strings do not match")
+    quit()
+
+dist = max([sum(c1 != c2 for c1, c2 in zip(s, string)) for string in strings])
+
+print("String has max distance {}".format(dist))