🎄 2019 Day 1 Complete! :D 🎄

2019/day01/main.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"math"
+	"os"
+	"strconv"
+)
+
+func main() {
+	inp := StdinToStringSlice()
+	fmt.Println("Fuel Required:", part1(inp))
+}
+
+func part1(inp []string) int {
+	var total int
+	for _, v := range inp {
+		total = total + part2(fuelRequired(float64(Atoi(v))))
+	}
+	return total
+}
+
+func part2(fuel int) int {
+	ret := fuel
+	for fuel > 0 {
+		fuel = fuelRequired(float64(fuel))
+		fmt.Println(fuel)
+		ret = ret + fuel
+	}
+	return ret
+}
+
+func fuelRequired(mass float64) int {
+	res, _ := math.Modf(mass / 3)
+	if int(res)-2 < 0 {
+		return 0
+	}
+	return int(res) - 2
+}
+
+func StdinToStringSlice() []string {
+	var input []string
+	scanner := bufio.NewScanner(os.Stdin)
+	for scanner.Scan() {
+		input = append(input, scanner.Text())
+	}
+	return input
+}
+
+func Atoi(i string) int {
+	var ret int
+	var err error
+	if ret, err = strconv.Atoi(i); err != nil {
+		log.Fatal("Invalid Atoi")
+	}
+	return ret
+}