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Day 22

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Sven Weidauer 2020-12-22 07:46:50 +01:00
parent 81198be13a
commit dc25ae1ea7
2 changed files with 180 additions and 0 deletions
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93
AdventOfCode2020.xcodeproj/project.pbxproj
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87
day22/main.swift Normal file
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@ -0,0 +1,87 @@
import Foundation
let data = loadData(day: 22)
let scanner = Scanner(string: data)
guard scanner.string("Player 1:") else { fatalError() }
let p1 = scanner.integers()
var player1Deck = p1
guard scanner.string("Player 2:") else { fatalError() }
let p2 = scanner.integers()
var player2Deck = p2
assert(player1Deck.count == player2Deck.count)
while !player1Deck.isEmpty && !player2Deck.isEmpty {
let a = player1Deck.removeFirst()
let b = player2Deck.removeFirst()
if a > b {
player1Deck.append(contentsOf: [a, b])
} else {
player2Deck.append(contentsOf: [b, a])
}
}
func calculateScore(_ deck: [Int]) -> Int {
deck.reversed().enumerated().reduce(0) { $0 + $1.element * ($1.offset + 1) }
}
if player2Deck.isEmpty {
print("Player 1 wins", calculateScore(player1Deck))
} else {
print("Player 2 wins", calculateScore(player2Deck))
}
struct PlayedDeck: Hashable {
let player1: [Int]
let player2: [Int]
}
var playedDecks: Set<PlayedDeck> = []
func playGame(deck1: [Int], deck2: [Int]) -> (winner: Bool, score: Int) {
var deck1 = deck1
var deck2 = deck2
var playedDecks: Set<PlayedDeck> = []
while !deck1.isEmpty && !deck2.isEmpty {
if !playedDecks.insert(PlayedDeck(player1: deck1, player2: deck2)).inserted {
return (true, calculateScore(deck1))
}
playRound(deck1: &deck1, deck2: &deck2)
}
let winner = deck2.isEmpty
return (winner, winner ? calculateScore(deck1) : calculateScore(deck2))
}
func playRound(deck1: inout [Int], deck2: inout [Int]) {
let a = deck1.removeFirst()
let b = deck2.removeFirst()
let winner: Bool
if a <= deck1.count && b <= deck2.count {
winner = playGame(deck1: Array(deck1[0..<a]), deck2: Array(deck2[0..<b])).winner
} else {
winner = a > b
}
if winner {
deck1.append(contentsOf: [a, b])
} else {
deck2.append(contentsOf: [b, a])
}
}
player1Deck = p1
player2Deck = p2
let (winner, score) = playGame(deck1: p1, deck2: p2)
if winner {
print("Player 1 wins", score)
} else {
print("Player 2 wins", score)
}