Random uncommited stuff

1 files changed, 71 insertions, 0 deletions

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
+}