day6/daySix.go

@@ -1,105 +0,0 @@
-package day6
-
-import (
-	"fmt"
-	"log"
-	"math"
-	"os"
-	"strconv"
-	"strings"
-)
-
-func Run() int {
-	race := ReadInput2("day6/input")
-
-	log.Printf("input %+v\n", race)
-	return race.countWinningMoves()
-}
-
-type Race struct {
-	Time, Target int
-}
-
-func (r Race) countWinningMoves() int {
-	// oh and it's simmetrical
-	leftPad := 0
-	rightPad := 0
-	for i := 0; i < (r.Time / 2 + 1); i++ {
-		if i * (r.Time - i) > r.Target {
-			leftPad = i
-			break
-		}
-	}
-	for i := 0; i < (r.Time / 2 + 1); i++ {
-		time := r.Time - i
-		if time * (r.Time - time) > r.Target {
-			rightPad = i
-			break
-		}
-	}
-
-	result := r.Time + 1 - leftPad - rightPad
-	log.Printf("for race %+v got left %d and right %d for total wind %d\n", r, leftPad, rightPad, result)
-	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)
-
-	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++ {
-		time, err1 := strconv.Atoi(times[i])
-		target, err2 := strconv.Atoi(distances[i])
-		if err1 != nil || err2 != nil {
-			panic(fmt.Sprintf("error reading race %d from %s %s\n", i, times[i], distances[i]))
-		}
-		race := Race{
-			Time: time,
-			Target: target,
-		}
-		result = append(result, race)
-	}
-
-	return result
-}
-
-
-
-// my guess is that i can search from start and end into middle and stop when i find solution
-// from the way i think derivation of x*y works
-// but first - read in the input. with strings.Fields should be easy

day6/example

@@ -1,2 +0,0 @@
-Time:      7  15   30
-Distance:  9  40  200

day6/input

@@ -1,2 +0,0 @@
-Time:        40     82     91     66
-Distance:   277   1338   1349   1063

main.go

@@ -3,11 +3,11 @@ package main
 import (
 	"log"
 
-	"sunshine.industries/aoc2023/day6"
+	"sunshine.industries/aoc2023/day5"
 )
 
 func main() {
 	log.Print("> starting run:")
-	result := day6.Run()
+	result := day5.Run()
 	log.Printf("day4 result: %d\n****\n", result)
 }