day 2

02/main.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func main() {
+	start := time.Now()
+	partOne()
+	duration := time.Since(start)
+	partTwo()
+	duration2 := time.Since(start)
+	fmt.Printf("p1: %s, p2: %s\n", duration, duration2-duration)
+}
+
+func makeScanner(test bool) *bufio.Scanner {
+	var f *os.File
+	if test {
+		f, _ = os.Open("inputs/testinput")
+	} else {
+		f, _ = os.Open("inputs/input")
+	}
+	reader := bufio.NewReader(f)
+	return bufio.NewScanner(reader)
+}
+
+func mustAtoi(line string) int {
+	i, _ := strconv.Atoi(line)
+	return i
+}
+
+func partOne() {
+	scanner := makeScanner(false)
+
+	var up, down, forward int
+	for scanner.Scan() {
+		line := scanner.Text()
+		dir, i := strings.Split(line, " ")[0], mustAtoi(strings.Split(line, " ")[1])
+		switch dir {
+		case "forward":
+			forward += i
+		case "down":
+			down += i
+		case "up":
+			up += i
+		}
+	}
+	fmt.Println(forward * (down - up))
+}
+
+func partTwo() {
+	scanner := makeScanner(false)
+
+	var horizontal, vertical, aim int
+	for scanner.Scan() {
+		line := scanner.Text()
+		dir, i := strings.Split(line, " ")[0], mustAtoi(strings.Split(line, " ")[1])
+		switch dir {
+		case "forward":
+			horizontal += i
+			vertical += (i * aim)
+		case "down":
+			aim += i
+		case "up":
+			aim -= i
+		}
+	}
+	fmt.Println(horizontal * vertical)
+}