diff --git a/lab3/zad3/.gitignore b/lab3/zad3/.gitignore
new file mode 100644
index 0000000..a9bbb74
--- /dev/null
+++ b/lab3/zad3/.gitignore
@@ -0,0 +1,2 @@
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diff --git a/lab3/zad3/Cargo.lock b/lab3/zad3/Cargo.lock
new file mode 100644
index 0000000..286e2c5
--- /dev/null
+++ b/lab3/zad3/Cargo.lock
@@ -0,0 +1,293 @@
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+ "windows_x86_64_gnullvm",
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+
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+name = "zad2"
+version = "0.1.0"
+dependencies = [
+ "dashmap",
+ "libgen",
+ "libselect",
+ "rayon",
+]
diff --git a/lab3/zad3/Cargo.toml b/lab3/zad3/Cargo.toml
new file mode 100644
index 0000000..4971c79
--- /dev/null
+++ b/lab3/zad3/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "zad2"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+libgen = { path = "../../libgen" }
+libselect = { path = "../../libselect" }
+rayon = "1.10.0"
+dashmap = "5.5.3"
diff --git a/lab3/zad3/gnuplot/comp.gp b/lab3/zad3/gnuplot/comp.gp
new file mode 100644
index 0000000..105e89b
--- /dev/null
+++ b/lab3/zad3/gnuplot/comp.gp
@@ -0,0 +1,14 @@
+set title "Average comparisons, n ∈ {100, 200, ..., 50000}"
+set style data lines
+
+set xlabel "n"
+set ylabel "Average comparisons"
+set term pdfcairo font "JetBrainsMono-NF,12"
+
+plot "./results/result" \
+using 1:2 t "Select 3", \
+"" using 1:5 t "Select 5", \
+"" using 1:8 t "Select 7", \
+"" using 1:11 t "Select 9"
+
+# vim: ft=gnuplot
diff --git a/lab3/zad3/gnuplot/comp_n.gp b/lab3/zad3/gnuplot/comp_n.gp
new file mode 100644
index 0000000..9031226
--- /dev/null
+++ b/lab3/zad3/gnuplot/comp_n.gp
@@ -0,0 +1,14 @@
+set title "Average comparisons / n, n ∈ {100, 200, ..., 50000}"
+set style data lines
+
+set xlabel "n"
+set ylabel "Average comparisons / n"
+set term pdfcairo font "JetBrainsMono-NF,12"
+
+plot "./results/result" \
+using 1:14 t "Select 3", \
+"" using 1:17 t "Select 5", \
+"" using 1:20 t "Select 7", \
+"" using 1:23 t "Select 9"
+
+# vim: ft=gnuplot
diff --git a/lab3/zad3/gnuplot/swap.gp b/lab3/zad3/gnuplot/swap.gp
new file mode 100644
index 0000000..41491e4
--- /dev/null
+++ b/lab3/zad3/gnuplot/swap.gp
@@ -0,0 +1,14 @@
+set title "Average swaps, n ∈ {100, 200, ..., 50000}"
+set style data lines
+
+set xlabel "n"
+set ylabel "Average swaps"
+set term pdfcairo font "JetBrainsMono-NF,12"
+
+plot "./results/result" \
+using 1:3 t "Select 3", \
+"" using 1:6 t "Select 5", \
+"" using 1:9 t "Select 7", \
+"" using 1:12 t "Select 9"
+
+# vim: ft=gnuplot
diff --git a/lab3/zad3/gnuplot/swap_n.gp b/lab3/zad3/gnuplot/swap_n.gp
new file mode 100644
index 0000000..2931d1c
--- /dev/null
+++ b/lab3/zad3/gnuplot/swap_n.gp
@@ -0,0 +1,14 @@
+set title "Average swaps / n, n ∈ {100, 200, ..., 50000}"
+set style data lines
+
+set xlabel "n"
+set ylabel "Average swaps / n"
+set term pdfcairo font "JetBrainsMono-NF,12"
+
+plot "./results/result" \
+using 1:15 t "Select 3", \
+"" using 1:18 t "Select 5", \
+"" using 1:21 t "Select 7", \
+"" using 1:24 t "Select 9"
+
+# vim: ft=gnuplot
diff --git a/lab3/zad3/gnuplot/time.gp b/lab3/zad3/gnuplot/time.gp
new file mode 100644
index 0000000..85e9d30
--- /dev/null
+++ b/lab3/zad3/gnuplot/time.gp
@@ -0,0 +1,14 @@
+set title "Average time, n ∈ {100, 200, ..., 50000}"
+set style data lines
+
+set xlabel "n"
+set ylabel "Average time"
+set term pdfcairo font "JetBrainsMono-NF,12"
+
+plot "./results/result" \
+using 1:4 t "Select 3", \
+"" using 1:7 t "Select 5", \
+"" using 1:10 t "Select 7", \
+"" using 1:13 t "Select 9"
+
+# vim: ft=gnuplot
diff --git a/lab3/zad3/gnuplot/time_n.gp b/lab3/zad3/gnuplot/time_n.gp
new file mode 100644
index 0000000..beb3c49
--- /dev/null
+++ b/lab3/zad3/gnuplot/time_n.gp
@@ -0,0 +1,14 @@
+set title "Average time / n, n ∈ {100, 200, ..., 50000}"
+set style data lines
+
+set xlabel "n"
+set ylabel "Average time / n"
+set term pdfcairo font "JetBrainsMono-NF,12"
+
+plot "./results/result" \
+using 1:16 t "Select 3", \
+"" using 1:19 t "Select 5", \
+"" using 1:22 t "Select 7", \
+"" using 1:25 t "Select 9"
+
+# vim: ft=gnuplot
diff --git a/lab3/zad3/plots/comp.pdf b/lab3/zad3/plots/comp.pdf
new file mode 100644
index 0000000..2330ac3
Binary files /dev/null and b/lab3/zad3/plots/comp.pdf differ
diff --git a/lab3/zad3/plots/comp_n.pdf b/lab3/zad3/plots/comp_n.pdf
new file mode 100644
index 0000000..22192f7
Binary files /dev/null and b/lab3/zad3/plots/comp_n.pdf differ
diff --git a/lab3/zad3/plots/swap.pdf b/lab3/zad3/plots/swap.pdf
new file mode 100644
index 0000000..699c75b
Binary files /dev/null and b/lab3/zad3/plots/swap.pdf differ
diff --git a/lab3/zad3/plots/swap_n.pdf b/lab3/zad3/plots/swap_n.pdf
new file mode 100644
index 0000000..926a1db
Binary files /dev/null and b/lab3/zad3/plots/swap_n.pdf differ
diff --git a/lab3/zad3/plots/time.pdf b/lab3/zad3/plots/time.pdf
new file mode 100644
index 0000000..cee889a
Binary files /dev/null and b/lab3/zad3/plots/time.pdf differ
diff --git a/lab3/zad3/plots/time_n.pdf b/lab3/zad3/plots/time_n.pdf
new file mode 100644
index 0000000..91d16fa
Binary files /dev/null and b/lab3/zad3/plots/time_n.pdf differ
diff --git a/lab3/zad3/src/main.rs b/lab3/zad3/src/main.rs
new file mode 100644
index 0000000..a5d90b8
--- /dev/null
+++ b/lab3/zad3/src/main.rs
@@ -0,0 +1,164 @@
+use std::{fs::{self, OpenOptions}, io::{self, Write}, sync::Arc, time::SystemTime};
+
+use dashmap::DashMap;
+use libgen::gen_rand;
+use libselect::normal_select::NormalSelect;
+use libselect::Select;
+use rayon::{current_thread_index, iter::{IntoParallelIterator, ParallelIterator}};
+
+fn comp_avg(results_map: &DashMap<u64, Vec<(u64, u64, u128)>>) -> DashMap<u64, f64> {
+    results_map.iter()
+        .map(|ref_multi| {
+            let (i, results) = ref_multi.pair();
+            (*i, (results.iter()
+                    .map(|res| res.0)
+                    .sum::<u64>() as f64 / results.len() as f64))
+            }
+        )
+        .collect()
+}
+
+fn swap_avg(results_map: &DashMap<u64, Vec<(u64, u64, u128)>>) -> DashMap<u64, f64> {
+    results_map.iter()
+        .map(|ref_multi| {
+            let (i, results) = ref_multi.pair();
+            (*i, (results.iter()
+                    .map(|res| res.1)
+                    .sum::<u64>() as f64 / results.len() as f64))
+            }
+        )
+        .collect()
+}
+
+fn time_avg(results_map: &DashMap<u64, Vec<(u64, u64, u128)>>) -> DashMap<u64, f64> {
+    results_map.iter()
+        .map(|ref_multi| {
+            let (i, results) = ref_multi.pair();
+            (*i, (results.iter()
+                    .map(|res| res.2)
+                    .sum::<u128>() as f64 / results.len() as f64))
+            }
+        )
+        .collect()
+}
+
+fn main() -> io::Result<()> {
+
+    let m = 50;
+
+    let select_3_results: Arc<DashMap<u64, Vec<(u64, u64, u128)>>> = Arc::new(DashMap::new());
+    let select_5_results: Arc<DashMap<u64, Vec<(u64, u64, u128)>>> = Arc::new(DashMap::new());
+    let select_7_results: Arc<DashMap<u64, Vec<(u64, u64, u128)>>> = Arc::new(DashMap::new());
+    let select_9_results: Arc<DashMap<u64, Vec<(u64, u64, u128)>>> = Arc::new(DashMap::new());
+
+    let select_3_results_clone = Arc::clone(&select_3_results);
+    let select_5_results_clone = Arc::clone(&select_5_results);
+    let select_7_results_clone = Arc::clone(&select_7_results);
+    let select_9_results_clone = Arc::clone(&select_9_results);
+
+    (100u64..=50000u64).step_by(100).collect::<Vec<_>>().into_par_iter().for_each(move |n| {
+        if select_3_results_clone.get(&n).is_some() {
+            return;
+        }
+        if select_5_results_clone.get(&n).is_some() {
+            return;
+        }
+        if select_7_results_clone.get(&n).is_some() {
+            return;
+        }
+        if select_9_results_clone.get(&n).is_some() {
+            return;
+        }
+        println!("{}: starting n: {n}", current_thread_index().unwrap());
+        let input = gen_rand(n);
+
+        select_3_results_clone.insert(n, vec![]);
+        select_5_results_clone.insert(n, vec![]);
+        select_7_results_clone.insert(n, vec![]);
+        select_9_results_clone.insert(n, vec![]);
+
+        let mut select_3 = NormalSelect::new(false);
+        let mut select_5 = NormalSelect::new(false);
+        let mut select_7 = NormalSelect::new(false);
+        let mut select_9 = NormalSelect::new(false);
+
+        let k = n as usize / 2;
+        for _ in 0..m {
+            _ = std::io::stdout().flush();
+            let time_3 = SystemTime::now();
+            select_3.select_k(&input, k, 3);
+            let time_3 = time_3.elapsed().unwrap().as_millis();
+            let time_5 = SystemTime::now();
+            select_5.select_k(&input, k, 5);
+            let time_5 = time_5.elapsed().unwrap().as_millis();
+            let time_7 = SystemTime::now();
+            select_7.select_k(&input, k, 7);
+            let time_7 = time_7.elapsed().unwrap().as_millis();
+            let time_9 = SystemTime::now();
+            select_9.select_k(&input, k, 9);
+            let time_9 = time_9.elapsed().unwrap().as_millis();
+
+            select_3_results_clone.get_mut(&n).unwrap().push((select_3.num_comp(), select_3.num_swap(), time_3));
+            select_5_results_clone.get_mut(&n).unwrap().push((select_5.num_comp(), select_5.num_swap(), time_5));
+            select_7_results_clone.get_mut(&n).unwrap().push((select_7.num_comp(), select_7.num_swap(), time_7));
+            select_9_results_clone.get_mut(&n).unwrap().push((select_9.num_comp(), select_9.num_swap(), time_9));
+        }
+        println!("{}: finished n: {n}", current_thread_index().unwrap());
+    });
+
+    let select_3_comp_averages = comp_avg(&select_3_results);
+    let select_3_swap_averages = swap_avg(&select_3_results);
+    let select_3_time_averages = time_avg(&select_3_results);
+
+    let select_5_comp_averages = comp_avg(&select_5_results);
+    let select_5_swap_averages = swap_avg(&select_5_results);
+    let select_5_time_averages = time_avg(&select_5_results);
+
+    let select_7_comp_averages = comp_avg(&select_7_results);
+    let select_7_swap_averages = swap_avg(&select_7_results);
+    let select_7_time_averages = time_avg(&select_7_results);
+
+    let select_9_comp_averages = comp_avg(&select_9_results);
+    let select_9_swap_averages = swap_avg(&select_9_results);
+    let select_9_time_averages = time_avg(&select_9_results);
+
+
+    _ = fs::create_dir_all("./results");
+
+    let mut results_file = OpenOptions::new()
+        .create(true)
+        .write(true)
+        .truncate(true)
+        .open(format!("./results/result"))?;
+
+    for n in (100..=50000).step_by(100) {
+        writeln!(results_file, "{n} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {}",
+            select_3_comp_averages.get(&n).unwrap().value(),
+            select_3_swap_averages.get(&n).unwrap().value(),
+            select_3_time_averages.get(&n).unwrap().value(),
+            select_5_comp_averages.get(&n).unwrap().value(),
+            select_5_swap_averages.get(&n).unwrap().value(),
+            select_5_time_averages.get(&n).unwrap().value(),
+            select_7_comp_averages.get(&n).unwrap().value(),
+            select_7_swap_averages.get(&n).unwrap().value(),
+            select_7_time_averages.get(&n).unwrap().value(),
+            select_9_comp_averages.get(&n).unwrap().value(),
+            select_9_swap_averages.get(&n).unwrap().value(),
+            select_9_time_averages.get(&n).unwrap().value(),
+            select_3_comp_averages.get(&n).unwrap().value() / n as f64,
+            select_3_swap_averages.get(&n).unwrap().value() / n as f64,
+            select_3_time_averages.get(&n).unwrap().value() / n as f64,
+            select_5_comp_averages.get(&n).unwrap().value() / n as f64,
+            select_5_swap_averages.get(&n).unwrap().value() / n as f64,
+            select_5_time_averages.get(&n).unwrap().value() / n as f64,
+            select_7_comp_averages.get(&n).unwrap().value() / n as f64,
+            select_7_swap_averages.get(&n).unwrap().value() / n as f64,
+            select_7_time_averages.get(&n).unwrap().value() / n as f64,
+            select_9_comp_averages.get(&n).unwrap().value() / n as f64,
+            select_9_swap_averages.get(&n).unwrap().value() / n as f64,
+            select_9_time_averages.get(&n).unwrap().value() / n as f64,
+        )?;
+    }
+
+    Ok(())
+}