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https://github.com/onyx-and-iris/aoc2023.git
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35 lines
728 B
Go
35 lines
728 B
Go
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package main
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import (
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"fmt"
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"math"
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"strconv"
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)
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// calculateFaster uses quadratic formula to calculate number of ways to win
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func calculateFaster(time, recordDistance int) int {
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a := float64(-1)
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b := float64(time)
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c := float64(-(recordDistance + 1))
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x1 := (-b + math.Sqrt(math.Pow(b, 2)-4*a*c)) / (2 * a)
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x2 := (-b - math.Sqrt(math.Pow(b, 2)-4*a*c)) / (2 * a)
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return int(math.Floor(x2) - math.Ceil(x1) + 1)
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}
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func two(lines []string) int {
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timeStr := ""
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distStr := ""
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for _, data := range datas {
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timeStr += fmt.Sprintf("%d", data.time)
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distStr += fmt.Sprintf("%d", data.distance)
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}
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time, _ := strconv.Atoi(timeStr)
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distance, _ := strconv.Atoi(distStr)
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n := calculateFaster(time, distance)
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return n
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}
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