day 2 complete

Author: neutralinsomniac

02/02-pt1.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"time"
+)
+
+func checkErr(err error) {
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+}
+
+func main() {
+	start := time.Now()
+	file, err := os.Open("input")
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+
+	d := 0
+	x := 0
+	for scanner.Scan() {
+		s := scanner.Text()
+		if s == "" {
+			continue
+		}
+		if s[0] == 'f' {
+			tmp := 0
+			tmp, err = strconv.Atoi(s[8:])
+			checkErr(err)
+			x += tmp
+
+		} else if s[0] == 'd' {
+			tmp := 0
+			tmp, err = strconv.Atoi(s[5:])
+			checkErr(err)
+			d += tmp
+		} else if s[0] == 'u' {
+			tmp := 0
+			tmp, err = strconv.Atoi(s[3:])
+			checkErr(err)
+			d -= tmp
+		}
+	}
+	fmt.Println(d * x)
+	fmt.Println("time:", time.Since(start))
+}

02/02-pt2.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"time"
+)
+
+func checkErr(err error) {
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+}
+
+func main() {
+	start := time.Now()
+	file, err := os.Open("input")
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+
+	d := 0
+	x := 0
+	aim := 0
+	for scanner.Scan() {
+		s := scanner.Text()
+		if s == "" {
+			continue
+		}
+		if s[0] == 'f' {
+			tmp := 0
+			tmp, err = strconv.Atoi(s[8:])
+			checkErr(err)
+			x += tmp
+			d += aim * tmp
+		} else if s[0] == 'd' {
+			tmp := 0
+			tmp, err = strconv.Atoi(s[5:])
+			checkErr(err)
+			aim += tmp
+		} else if s[0] == 'u' {
+			tmp := 0
+			tmp, err = strconv.Atoi(s[3:])
+			checkErr(err)
+			aim -= tmp
+		}
+	}
+	fmt.Println(d * x)
+	fmt.Println("time:", time.Since(start))
+}

02/Makefile

@@ -0,0 +1,3 @@
+all:
+	@go run 02-pt1.go
+	@go run 02-pt2.go