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| 1 | +import Foundation |
| 2 | + |
| 3 | +struct Blueprint { |
| 4 | + let id: Int |
| 5 | + let oreOre: Int |
| 6 | + let clayOre: Int |
| 7 | + let obsidianOre: Int |
| 8 | + let obsidianClay: Int |
| 9 | + let geodeOre: Int |
| 10 | + let geodeObsidian: Int |
| 11 | +} |
| 12 | + |
| 13 | +func inputData() -> [Blueprint] { |
| 14 | + var result = [Blueprint]() |
| 15 | + for line in stringsFromFile() where line != "" { |
| 16 | + let parts = line.replacingOccurrences(of: ":", with: "").split(separator: " ") |
| 17 | + result.append(Blueprint( |
| 18 | + id: Int(parts[1])!, |
| 19 | + oreOre: Int(parts[6])!, |
| 20 | + clayOre: Int(parts[12])!, |
| 21 | + obsidianOre: Int(parts[18])!, |
| 22 | + obsidianClay: Int(parts[21])!, |
| 23 | + geodeOre: Int(parts[27])!, |
| 24 | + geodeObsidian: Int(parts[30])! |
| 25 | + )) |
| 26 | + } |
| 27 | + return result |
| 28 | +} |
| 29 | + |
| 30 | +extension Blueprint { |
| 31 | + func geodes(_ oreBot: Int, _ clayBot: Int, _ obsidianBot: Int, _ geodeBot: Int, _ ore: Int, _ clay: Int, _ obsidian: Int, _ geode: Int, _ timeLeft: Int) -> Int { |
| 32 | + |
| 33 | + let oreNext = ore + oreBot |
| 34 | + let clayNext = clay + clayBot |
| 35 | + let obsidianNext = obsidian + obsidianBot |
| 36 | + let geodeNext = geode + geodeBot |
| 37 | + |
| 38 | + if timeLeft <= 0 { |
| 39 | + return geodeNext |
| 40 | + } |
| 41 | + if ore >= self.geodeOre && obsidian >= self.geodeObsidian { |
| 42 | + return geodes(oreBot, clayBot, obsidianBot, geodeBot + 1, oreNext - self.geodeOre, clayNext, obsidianNext - self.geodeObsidian, geodeNext, timeLeft - 1) |
| 43 | + } |
| 44 | + if ore >= self.obsidianOre && clay >= self.obsidianClay { |
| 45 | + return geodes(oreBot, clayBot, obsidianBot + 1, geodeBot, oreNext - self.obsidianOre, clayNext - self.obsidianClay, obsidianNext, geodeNext, timeLeft - 1) |
| 46 | + } |
| 47 | + var results = [0] |
| 48 | + if ore < 5 { |
| 49 | + results.append(geodes(oreBot, clayBot, obsidianBot, geodeBot, oreNext, clayNext, obsidianNext, geodeNext, timeLeft - 1)) |
| 50 | + } |
| 51 | + if ore >= self.oreOre { |
| 52 | + results.append(geodes(oreBot + 1, clayBot, obsidianBot, geodeBot, oreNext - self.oreOre, clayNext, obsidianNext, geodeNext, timeLeft - 1)) |
| 53 | + } |
| 54 | + if ore >= self.clayOre { |
| 55 | + results.append(geodes(oreBot, clayBot + 1, obsidianBot, geodeBot, oreNext - self.clayOre, clayNext, obsidianNext, geodeNext, timeLeft - 1)) |
| 56 | + } |
| 57 | + return results.reduce(0, max) |
| 58 | + } |
| 59 | +} |
| 60 | +public func part1() -> Int { |
| 61 | + inputData().map({ $0.id * $0.geodes(1, 0, 0, 0, 0, 0, 0, 0, 23) }) |
| 62 | + .reduce(0, +) |
| 63 | +} |
| 64 | + |
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