64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
package dayfourteen
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import (
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"advent-of-code/internal/registry"
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"os"
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"regexp"
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"strconv"
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"strings"
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)
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func init() {
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registry.Register("2015D14", ParseInput, PartOne, PartTwo)
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}
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type Reindeer struct {
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Speed int
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FlyTime int
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RestTime int
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CycleTime int
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}
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func ParseInput(filepath string) []string {
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content, _ := os.ReadFile(filepath)
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return strings.Split(string(content), "\n")
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}
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func calculateMaxDistance(data []string, time int) int {
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maxDistance := 0
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pattern := regexp.MustCompile(`\w+ can fly (\d+) km/s for (\d+) seconds, but then must rest for (\d+) seconds\.`)
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for _, line := range data {
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matches := pattern.FindStringSubmatch(line)
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var reindeer Reindeer
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reindeer.Speed, _ = strconv.Atoi(matches[1])
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reindeer.FlyTime, _ = strconv.Atoi(matches[2])
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reindeer.RestTime, _ = strconv.Atoi(matches[3])
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reindeer.CycleTime = reindeer.FlyTime + reindeer.RestTime
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fullCycles := time / reindeer.CycleTime
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distance := fullCycles * reindeer.Speed * reindeer.FlyTime
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remainingTime := time % reindeer.CycleTime
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if remainingTime > reindeer.FlyTime {
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distance += reindeer.Speed * reindeer.FlyTime
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} else {
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distance += reindeer.Speed * remainingTime
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}
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if distance > maxDistance {
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maxDistance = distance
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}
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}
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return maxDistance
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}
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func PartOne(data []string) int {
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return calculateMaxDistance(data, 2503)
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}
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func PartTwo(data []string) int {
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return 0
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}
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