4 files changed, 123 insertions, 0 deletions
diff --git a/protohackers/1-prime-test/flake.lock b/protohackers/1-prime-test/flake.lock
new file mode 100644
index 0000000..6d89d83
--- /dev/null
+++ b/protohackers/1-prime-test/flake.lock
@@ -0,0 +1,25 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1661353537,
+        "narHash": "sha256-1E2IGPajOsrkR49mM5h55OtYnU0dGyre6gl60NXKITE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "0e304ff0d9db453a4b230e9386418fd974d5804a",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/protohackers/1-prime-test/flake.nix b/protohackers/1-prime-test/flake.nix
new file mode 100644
index 0000000..d8479b2
--- /dev/null
+++ b/protohackers/1-prime-test/flake.nix
@@ -0,0 +1,24 @@
+{
+  description = "Protohackers 1: Prime test";
+
+  outputs = { self, nixpkgs }:
+  let
+    system = "x86_64-linux";
+    pkgs = import nixpkgs { inherit system; };
+  in rec
+  {
+    packages.x86_64-linux.docker-image = pkgs.dockerTools.buildImage {
+      name = "prime-test";
+      config = {
+        Cmd = [ "${packages.x86_64-linux.binary}/bin/1-prime-test" ];
+      };
+    };
+    packages.x86_64-linux.binary = pkgs.buildGoModule {
+      pname = "prime-test";
+      version = "0.0.1";
+      src = self;
+
+      vendorSha256 = "pQpattmS9VmO3ZIQUFn66az8GSmB4IvYhTTCFn6SUmo=";
+    };
+  };
+}
diff --git a/protohackers/1-prime-test/go.mod b/protohackers/1-prime-test/go.mod
new file mode 100644
index 0000000..78c74d2
--- /dev/null
+++ b/protohackers/1-prime-test/go.mod
@@ -0,0 +1,3 @@
+module 1-prime-test
+
+go 1.18
diff --git a/protohackers/1-prime-test/main.go b/protohackers/1-prime-test/main.go
new file mode 100644
index 0000000..66e7f16
--- /dev/null
+++ b/protohackers/1-prime-test/main.go
@@ -0,0 +1,71 @@
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"log"
+	"math"
+	"net"
+)
+
+func main() {
+	listener, err := net.Listen("tcp", "0.0.0.0:7000")
+	if err != nil {
+		panic(err)
+	}
+
+	for {
+		go handle(listener.Accept())
+	}
+}
+
+func handle(conn net.Conn, err error) {
+	if err != nil {
+		log.Println(err)
+		return
+	}
+	defer conn.Close()
+
+	reader := bufio.NewScanner(conn)
+	writer := json.NewEncoder(conn)
+	for reader.Scan() {
+		log.Println("received ", reader.Text())
+		var req struct {
+			Method string   `json:"method"`
+			Number *float64 `json:"number"`
+		}
+		if err := json.Unmarshal(reader.Bytes(), &req); err != nil {
+			log.Println(err)
+			return
+		}
+		if req.Method != "isPrime" || req.Number == nil {
+			_, err := conn.Write([]byte("you dingus"))
+			if err != nil {
+				log.Println(err)
+			}
+			return
+		}
+		res := struct {
+			Method string `json:"method"`
+			Prime  bool   `json:"prime"`
+		}{Method: "isPrime"}
+		n := int64(*req.Number)
+		if *req.Number == float64(n) {
+			res.Prime = isPrime(n)
+		}
+		if err := writer.Encode(res); err != nil {
+			log.Println(err)
+			return
+		}
+	}
+}
+
+func isPrime(n int64) bool {
+	max := int64(math.Sqrt(float64(n)))
+	for i := int64(2); i <= max; i++ {
+		if n%i == 0 {
+			return false
+		}
+	}
+	return n > 1
+}