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package part_02
import (
"os"
"strconv"
"strings"
)
const USE_SAMPLE = false
/**
* Tried:
* - 24655068 (correct!)
*/
func Solve() {
var filePath string
if USE_SAMPLE {
filePath = "../_input/day_06_part_02_sample.txt"
} else {
filePath = "../_input/day_06.txt"
}
contents, _ := os.ReadFile(filePath)
lines := strings.Split(string(contents), "\r\n")
timeLine := lines[0]
time := parseTimeLine(timeLine)
distLine := lines[1]
distance := parseDistanceLine(distLine)
answer := calculateAnswer(time, distance)
println(answer)
}
func parseTimeLine(timeLine string) int {
prefix := "Time:"
return parseLine(prefix, timeLine)
}
func parseDistanceLine(distLine string) int {
prefix := "Distance:"
return parseLine(prefix, distLine)
}
func parseLine(prefix string, line string) int {
withoutTitle := strings.TrimPrefix(line, prefix)
numbers := []string{}
for _, number := range strings.Split(withoutTitle, " ") {
if number == "" {
continue
}
numbers = append(numbers, number)
}
number := strings.Join(numbers, "")
numberInt, err := strconv.Atoi(number)
if err != nil {
panic(err)
}
return numberInt
}
func calculateAnswer(maxTime int, recordDistance int) int {
var greaterThanRecord []int
for buttonPressedFor := 0; buttonPressedFor <= maxTime; buttonPressedFor++ {
distance := calculateDistance(buttonPressedFor, maxTime)
if distance > recordDistance {
greaterThanRecord = append(greaterThanRecord, distance)
}
}
return len(greaterThanRecord)
}
func calculateDistance(buttonPressedFor int, maxTime int) int {
return buttonPressedFor * (maxTime - buttonPressedFor)
}
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