83 lines
2.4 KiB
Swift
83 lines
2.4 KiB
Swift
|
import Foundation
|
||
|
|
|
||
|
|
let regex = try! NSRegularExpression(pattern: #"^([a-z]+) can fly (\d+) km/s for (\d+) seconds, but then must rest for (\d+) seconds.$"#, options: [.caseInsensitive, .anchorsMatchLines])
|
||
|
|
|
||
|
|
struct Reindeer {
|
||
|
|
var name: String
|
||
|
|
var flySpeed: Int
|
||
|
|
var flyDuration: Int
|
||
|
|
var restDuration: Int
|
||
|
|
|
||
|
|
var duration: Int
|
||
|
|
var resting: Bool = false
|
||
|
|
var distance: Int = 0
|
||
|
|
var points: Int = 0
|
||
|
|
|
||
|
|
mutating func step() {
|
||
|
|
duration -= 1
|
||
|
|
if !resting {
|
||
|
|
distance += flySpeed
|
||
|
|
}
|
||
|
|
|
||
|
|
if duration == 0 {
|
||
|
|
resting.toggle()
|
||
|
|
duration = resting ? restDuration : flyDuration
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static func parse(_ input: String) -> [Reindeer] {
|
||
|
|
let matches = regex.matches(in: input, options: [], range: NSRange(input.startIndex..., in: input))
|
||
|
|
return matches.map { Reindeer(match: $0, in: input) }
|
||
|
|
}
|
||
|
|
|
||
|
|
init(match: NSTextCheckingResult, in string: String) {
|
||
|
|
name = String(match.string(index: 1, in: string))
|
||
|
|
flySpeed = Int(match.string(index: 2, in: string))!
|
||
|
|
flyDuration = Int(match.string(index: 3, in: string))!
|
||
|
|
restDuration = Int(match.string(index: 4, in: string))!
|
||
|
|
|
||
|
|
duration = flyDuration
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
extension NSTextCheckingResult {
|
||
|
|
func string(index: Int, in string: String) -> Substring {
|
||
|
|
let range = Range(self.range(at: index), in: string)!
|
||
|
|
return string[range]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
let input = """
|
||
|
|
Vixen can fly 19 km/s for 7 seconds, but then must rest for 124 seconds.
|
||
|
|
Rudolph can fly 3 km/s for 15 seconds, but then must rest for 28 seconds.
|
||
|
|
Donner can fly 19 km/s for 9 seconds, but then must rest for 164 seconds.
|
||
|
|
Blitzen can fly 19 km/s for 9 seconds, but then must rest for 158 seconds.
|
||
|
|
Comet can fly 13 km/s for 7 seconds, but then must rest for 82 seconds.
|
||
|
|
Cupid can fly 25 km/s for 6 seconds, but then must rest for 145 seconds.
|
||
|
|
Dasher can fly 14 km/s for 3 seconds, but then must rest for 38 seconds.
|
||
|
|
Dancer can fly 3 km/s for 16 seconds, but then must rest for 37 seconds.
|
||
|
|
Prancer can fly 25 km/s for 6 seconds, but then must rest for 143 seconds.
|
||
|
|
"""
|
||
|
|
|
||
|
|
|
||
|
|
var group = Reindeer.parse(input)
|
||
|
|
|
||
|
|
for _ in 0..<2503 {
|
||
|
|
for i in group.indices {
|
||
|
|
group[i].step()
|
||
|
|
}
|
||
|
|
|
||
|
|
let lead = group.map(\.distance).max()!
|
||
|
|
|
||
|
|
for i in group.indices where group[i].distance == lead {
|
||
|
|
group[i].points += 1
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
group
|
||
|
|
|
||
|
|
group
|
||
|
|
.sorted { $0.points > $1.points }
|
||
|
|
.first
|
||
|
|
|