day6, part2

day6/daySix.go

@@ -3,19 +3,17 @@ package day6
 import (
 	"fmt"
 	"log"
+	"math"
 	"os"
 	"strconv"
 	"strings"
 )
 
 func Run() int {
-	input := ReadInput("day6/input")
-	result := 1
-	for _, race := range input {
-		result *= race.countWinningMoves()
-	}
-	log.Printf("input %+v\n", input)
-	return result
+	race := ReadInput2("day6/input")
+
+	log.Printf("input %+v\n", race)
+	return race.countWinningMoves()
 }
 
 type Race struct {
@@ -45,6 +43,34 @@ func (r Race) countWinningMoves() int {
 	return result
 }
 
+func ReadInput2(filename string) Race {
+	runningTime := 0
+	runningDistance := 0
+
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprintln("problem readin input : ", filename))
+	}
+	text := strings.Split( string(bytes), "\n")
+	times := strings.Fields(text[0])
+	distances := strings.Fields(text[1])
+
+	for i := 1; i < len(times); i++ {
+		timeStr := times[i]
+		distanceStr := distances[i]
+		time, err1 := strconv.Atoi(timeStr)
+		distance, err2 := strconv.Atoi(distanceStr)
+		if err1 != nil || err2 != nil {
+			panic(fmt.Sprintf("error reading race %d from %s %s\n", i, times[i], distances[i]))
+		}
+
+		runningTime = runningTime * int(math.Pow10(len(timeStr))) + time
+		runningDistance = runningDistance * int(math.Pow10(len(distanceStr))) + distance
+	}
+
+	return Race{ runningTime, runningDistance }
+}
+
 func ReadInput(filename string) []Race {
 	result := make([]Race, 0)