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