9.go

package main

import (
    "fmt"
    "os"
    "io/ioutil"
    "net/http"
    "strings"
    "strconv"
    "math/big"
)

func main() {

    URL := "https://challenges.aquaq.co.uk/challenge/9/input.txt"
    body := strings.TrimSpace(string(getbody(URL)))

    res := big.NewInt(1)
    for _, word := range strings.Split(body, "\n") {
        n, _ := strconv.Atoi(word)
        res.Mul(res, big.NewInt(int64(n)))
    }
    
    fmt.Println("res/", res)
}

func getbody(URL string) []uint8 {
    session_value := os.Getenv("COOK")
    if session_value == "" {
        panic("session/empty")
    }
    conn := &http.Client {}
    req, _ := http.NewRequest("GET", URL, nil)
    session := &http.Cookie {
        Name:   "session",
        Value:  session_value,
    }
    req.AddCookie( session )
    resp, _ := conn.Do(req)
    defer resp.Body.Close()
    body, _ := ioutil.ReadAll(resp.Body)
    return body
}

const Yell, Cyan, Rest string = "\033[33m", "\033[36m", "\033[0m"
func YELL(s string)string{ return Yell + s + Rest }
func CYAN(s string)string{ return Cyan + s + Rest }