82 lines
1.5 KiB
Go
82 lines
1.5 KiB
Go
package main
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import (
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"AoC2020/helper"
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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func main() {
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args := os.Args[1:]
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input, err := helper.GetInput(args[0])
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if err != nil {
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fmt.Println(err)
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}
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part1(input)
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part2(input)
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}
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func checkCorrect(time int, bustimes []int) bool {
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p := 0
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fmt.Print(bustimes)
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for _, bustime := range bustimes {
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if time%bustime > p {
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return false
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}
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p = time % bustime
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}
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return true
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}
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func part2(input []string) {
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busses := strings.Split(input[1], ",")
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var busTimes []int
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for _, val := range busses {
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if val != "x" {
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busTime, _ := strconv.Atoi(val)
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busTimes = append(busTimes, busTime)
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} else {
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busTimes = append(busTimes, 0)
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}
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}
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step := busTimes[0]
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time := 0
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for i, val := range busTimes[1:] {
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if val != 0 {
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fmt.Printf("Value: %d Step: %d \n",val,step)
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for (time+i+1)%val != 0 {
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time += step
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}
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step = step * val
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}
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}
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fmt.Println(time)
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}
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func part1(input []string) {
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arrival, _ := strconv.Atoi(input[0])
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busses := strings.Split(input[1], ",")
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minWaitTime := 999
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choosenBus := 0
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for _, val := range busses {
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if val != "x" {
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busTime, _ := strconv.Atoi(val)
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diff := arrival / busTime
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waitTime := busTime*(diff+1) - arrival
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if minWaitTime > waitTime {
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minWaitTime = waitTime
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choosenBus = busTime
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}
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}
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}
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fmt.Println(minWaitTime*choosenBus)
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}
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func timestampToMinutes(timeStamp string) int {
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hours := int(timeStamp[0] - '0')
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minutes, _ := strconv.Atoi(string(timeStamp[1:]))
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return hours*60 + minutes
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}
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