diff --git a/lab3/rand_select/Cargo.lock b/lab3/rand_select/Cargo.lock
new file mode 100644
index 0000000..382fae8
--- /dev/null
+++ b/lab3/rand_select/Cargo.lock
@@ -0,0 +1,88 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "getrandom"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4567c8db10ae91089c99af84c68c38da3ec2f087c3f82960bcdbf3656b6f4d7"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.154"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae743338b92ff9146ce83992f766a31066a91a8c84a45e0e9f21e7cf6de6d346"
+
+[[package]]
+name = "libselect"
+version = "0.1.0"
+dependencies = [
+ "libsort",
+ "rand",
+]
+
+[[package]]
+name = "libsort"
+version = "0.1.0"
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "rand_select"
+version = "0.1.0"
+dependencies = [
+ "libselect",
+ "libsort",
+]
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
diff --git a/lab3/rand_select/Cargo.toml b/lab3/rand_select/Cargo.toml
index 26c3f9d..1f5ebc6 100644
--- a/lab3/rand_select/Cargo.toml
+++ b/lab3/rand_select/Cargo.toml
@@ -4,3 +4,5 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+libselect = { path = "../../libselect" }
+libsort = { path = "../../libsort" }
diff --git a/lab3/rand_select/src/main.rs b/lab3/rand_select/src/main.rs
index e7a11a9..2ed99e7 100644
--- a/lab3/rand_select/src/main.rs
+++ b/lab3/rand_select/src/main.rs
@@ -1,3 +1,59 @@
-fn main() {
-    println!("Hello, world!");
+use std::{io, process::exit};
+
+use libselect::{randomized_select::RandomizedSelect, Select};
+use libsort::{insertion_sort::InsertionSort, Sort};
+
+fn main() -> io::Result<()> {
+    let mut buffer = String::new();
+
+    let stdin = io::stdin();
+
+    stdin.read_line(&mut buffer)?;
+
+    let list_len = buffer.trim().parse::<u64>().expect("array length has to be u64");
+    buffer.clear();
+
+    stdin.read_line(&mut buffer)?;
+
+    let order_statistic = buffer.trim().parse::<usize>().expect("order statistic has to be usize");
+    buffer.clear();
+
+    if !(1..=list_len as usize).contains(&order_statistic) {
+        eprintln!("order statistic must be in range [1..{}]", list_len);
+        exit(1);
+    }
+
+    let mut list: Vec<u64> = vec![];
+
+    for i in 0..list_len {
+        stdin.read_line(&mut buffer)?;
+        list.push(
+            buffer.trim().parse::<u64>()
+                .expect(format!("element {} has to be u64", i).as_str())
+        );
+        buffer.clear();
+    }
+
+    let input_list: Vec<u64> = list.clone();
+
+    let print = input_list.len() <= 50;
+
+    let mut randomized = RandomizedSelect::new(print);
+
+    let result = randomized.select_mut(&mut list, order_statistic);
+
+    if print {
+        println!();
+        println!("start state: {:?}", input_list);
+        println!("end state: {:?}", list);
+        let mut insertion = InsertionSort::new(false);
+        println!("sorted array: {:?}", insertion.sort(&input_list));
+        println!("{} order statistic: {}", order_statistic, result);
+    }
+
+    println!("swaps: {}", randomized.num_swap());
+    println!("comparisons: {}", randomized.num_comp());
+
+    Ok(())
 }
+
diff --git a/libselect/src/randomized_select.rs b/libselect/src/randomized_select.rs
index d1dfc4d..3c032c8 100644
--- a/libselect/src/randomized_select.rs
+++ b/libselect/src/randomized_select.rs
@@ -1,6 +1,6 @@
 use rand::{thread_rng, Rng};
 
-use crate::{normal_select::NormalSelect, CompareResult, Select};
+use crate::{normal_select::NormalSelect, Select};
 
 pub struct RandomizedSelect {
     comparisons: u64,
@@ -10,20 +10,6 @@ pub struct RandomizedSelect {
 }
 
 impl RandomizedSelect {
-    fn swap(&mut self, list: &mut Vec<u64>, i: usize, j: usize) {
-        self.swaps += 1;
-        list.swap(i, j);
-    }
-    fn compare(&mut self, a: u64, b: u64) -> CompareResult {
-        self.comparisons += 1;
-        if a < b {
-            CompareResult::LESS
-        } else if a > b {
-            CompareResult::GREATER
-        } else {
-            CompareResult::EQUAL
-        }
-    }
 
     fn rand_partition(&mut self, list: &mut Vec<u64>, lo: usize, hi: usize) -> usize {
         let pivot = thread_rng().gen_range(lo..hi);