commit f43541dbd550eafc8c6b3d0807a4ecbf7faf0d77
Author: timeshifter <timeshifter@sumatrae>
Date:   Fri Jul 10 17:04:04 2026 +0200

    add problem 01

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b60de5b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+**/target
diff --git a/problem01/Cargo.lock b/problem01/Cargo.lock
new file mode 100644
index 0000000..68b378b
--- /dev/null
+++ b/problem01/Cargo.lock
@@ -0,0 +1,281 @@
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diff --git a/problem01/Cargo.toml b/problem01/Cargo.toml
new file mode 100644
index 0000000..3838b96
--- /dev/null
+++ b/problem01/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "problem01"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+tokio = { version = "1", features = ["full"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
diff --git a/problem01/src/main.rs b/problem01/src/main.rs
new file mode 100644
index 0000000..7ad3c3a
--- /dev/null
+++ b/problem01/src/main.rs
@@ -0,0 +1,116 @@
+use serde::Deserialize;
+use tokio::{
+    io::{AsyncBufReadExt, AsyncWriteExt, BufReader},
+    net::{TcpListener, TcpStream},
+};
+
+#[tokio::main]
+async fn main() -> tokio::io::Result<()> {
+    let listener = TcpListener::bind("0.0.0.0:10000").await?;
+
+    loop {
+        let (socket, _) = listener.accept().await?;
+        println!("new listener");
+        tokio::spawn(async move {
+            process_socket(socket).await;
+        });
+    }
+}
+
+async fn process_socket(socket: TcpStream) {
+    let (reader, mut writer) = tokio::io::split(socket);
+
+    let reader = BufReader::new(reader);
+
+    let mut lines = reader.lines();
+
+    while let Some(line) = lines.next_line().await.unwrap() {
+        let response = handle_line(&line);
+
+        match response {
+            Response::Valid(is_prime) => {
+                writer
+                    .write_all(b"{\"method\": \"isPrime\", \"prime\": ")
+                    .await
+                    .unwrap();
+                if is_prime {
+                    writer.write_all(b"true").await.unwrap();
+                } else {
+                    writer.write_all(b"false").await.unwrap();
+                }
+                writer.write_all(b"}\n").await.unwrap();
+                writer.flush().await.unwrap();
+            }
+            Response::Malformed => {
+                writer
+                    .write_all(b"{\"something\": \"malformed response\"}\n")
+                    .await
+                    .unwrap();
+                writer.flush().await.unwrap();
+                return;
+            }
+        }
+    }
+}
+
+fn handle_line(line: &str) -> Response {
+    let request: Request = match serde_json::from_str(line) {
+        Ok(inner) => inner,
+        Err(_) => return Response::Malformed,
+    };
+
+    let is_prime = match request.method.as_str() {
+        "isPrime" => handle_number(request.number),
+        _ => return Response::Malformed,
+    };
+
+    Response::Valid(is_prime)
+}
+
+fn handle_number(number: serde_json::Number) -> bool {
+    let number_f64 = match number.as_f64() {
+        Some(inner) => inner,
+        None => return false,
+    };
+
+    if number_f64.fract() != 0.0 {
+        return false;
+    }
+
+    if number_f64 < 0. {
+        return false;
+    }
+
+    is_prime(number_f64 as u64)
+}
+
+#[derive(Debug)]
+enum Response {
+    Valid(bool),
+    Malformed,
+}
+
+#[derive(Debug, Deserialize)]
+struct Request {
+    method: String,
+    number: serde_json::Number,
+}
+
+fn is_prime(n: u64) -> bool {
+    match n {
+        0 => false,
+        1 => false,
+        _ => trial_division(n),
+    }
+}
+
+fn trial_division(n: u64) -> bool {
+    let limit = (n as f64).sqrt() as u64;
+
+    for divisor in 2..=limit {
+        if n.is_multiple_of(divisor) {
+            return false;
+        }
+    }
+    true
+}