56 lines
1.1 KiB
Swift
56 lines
1.1 KiB
Swift
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@main
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struct Day21: Puzzle {
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func run() {
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part1()
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}
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func part1() {
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var die = Die()
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var player1 = Player(position: 6)
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var player2 = Player(position: 7)
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while true {
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if player1.move(die.roll3()) {
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print("Part 1: Player 1 won. ", die.rolls * player2.score)
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break
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}
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if player2.move(die.roll3()) {
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print("Part 1: Player 2 won. ", die.rolls * player1.score)
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break
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}
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}
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}
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struct Player {
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var position: Int
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var score: Int = 0
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mutating func move(_ roll: Int) -> Bool {
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position = 1 + (position + roll - 1) % 10
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score += position
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return score >= 1000
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}
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}
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struct Die {
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var rolls = 0
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var nextRoll = 1
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mutating func roll() -> Int {
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defer {
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rolls += 1
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nextRoll += 1
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}
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return nextRoll
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}
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mutating func roll3() -> Int {
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roll() + roll() + roll()
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}
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}
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}
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