aoc2023/day-6/one.go

package main

type data struct {
	time     int
	distance int
}

var datas = make([]data, 0)

// calculate returns the number of different ways to win a single race
func calculate(time, recordDistance int) int {
	distanceCovered := 0
	numWins := 0

	f := func(x, time int) int {
		return x * (time - x)
	}

	for i := 1; i < time; i++ {
		distanceCovered = f(i, time)
		if distanceCovered > recordDistance {
			numWins++
		}
	}
	return numWins
}

// one returns the product of all race calculations
func one(lines []string) int {
	parseLines(lines)

	product := 1
	for _, data := range datas {
		n := calculate(data.time, data.distance)
		product *= n
	}

	return product
}