day one

01/main.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"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 partOne() {
+	scanner := makeScanner(false)
+
+	p := 0
+	c := 0
+	for scanner.Scan() {
+		line := scanner.Text()
+		n, _ := strconv.Atoi(line)
+		if p != 0 && n > p {
+			c++
+		}
+		p = n
+	}
+	fmt.Println("part 1:", c)
+}
+
+func partTwo() {
+	scanner := makeScanner(false)
+
+	one, two, three := 0, 0, 0
+	c := 0
+	for scanner.Scan() {
+		line := scanner.Text()
+		n, _ := strconv.Atoi(line)
+		if one != 0 && two != 0 && three != 0 && one+two+three < two+three+n {
+			c++
+		}
+		one, two, three = two, three, n
+	}
+	fmt.Println("part 2:", c)
+}