day1 and 2 done & setup for day3

2021/day2/main.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func NewData(s string) Data {
+	f := strings.Fields(s)
+	a, err := strconv.Atoi(f[1])
+	if err != nil {
+		return Data{}
+	}
+	return Data{
+		Direction: f[0],
+		Amount:    a,
+	}
+}
+func GetData(s string) []Data {
+	var data []Data
+	r, err := os.Open(s)
+	if err != nil {
+		return data
+	}
+	fileScanner := bufio.NewScanner(r)
+	fileScanner.Split(bufio.ScanLines)
+	for fileScanner.Scan() {
+		data = append(data, NewData(fileScanner.Text()))
+	}
+	return data
+}
+
+type Data struct {
+	Direction string
+	Amount    int
+}
+
+func main() {
+	data := GetData("./data")
+	result := Part1(data)
+	fmt.Printf("Result part 1: %d\n", result)
+	result = Part2(data)
+	fmt.Printf("Result part 1: %d\n", result)
+}
+
+type Point struct {
+	X   int
+	Y   int
+	Aim int
+}
+
+func (p Point) Multiply() int {
+	return p.Y * p.X
+}
+
+func Part1(data []Data) int {
+	var point Point
+	for _, d := range data {
+		switch d.Direction {
+		case "forward":
+			point.X += d.Amount
+		case "down":
+			point.Y += d.Amount
+		case "up":
+			point.Y -= d.Amount
+		}
+	}
+	return point.Multiply()
+}
+
+func Part2(data []Data) int {
+	var point Point
+	for _, d := range data {
+		switch d.Direction {
+		case "forward":
+			point.X += d.Amount
+			point.Y += point.Aim * d.Amount
+		case "down":
+			point.Aim += d.Amount
+		case "up":
+			point.Aim -= d.Amount
+		}
+	}
+	return point.Multiply()
+}