06a

Sources/06/06.swift

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+//
+//  File.swift
+//
+//
+//  Created by Max Nuding on 05.12.21.
+//
+
+import Foundation
+import Runner
+
+class Fish: CustomStringConvertible {
+    var timer: Int
+    
+    var description: String { "\(timer)"}
+    
+    init(timer: Int = 8) {
+        self.timer = timer
+    }
+    
+    func tick() -> Fish? {
+        timer -= 1
+        if timer < 0 {
+            timer = 6
+            return Fish()
+        }
+        return nil
+    }
+}
+
+struct Day06: Runnable {
+    let inputPath: String
+    
+    func run() {
+        let input = try! String(contentsOfFile: inputPath)
+        let internalCounters = input
+            .trimmingCharacters(in: .newlines)
+            .components(separatedBy: ",")
+            .map { Fish(timer: Int($0)!) }
+        run(fish: internalCounters, numDays: 80)
+    }
+    
+    func run(fish: [Fish], numDays: Int) {
+        var tmpFish = fish
+        for _  in 1...numDays {
+            tmpFish.append(contentsOf: tmpFish.compactMap { $0.tick() })
+        }
+        print(tmpFish.count)
+    }
+}

Sources/06/main.swift

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+//
+//  File.swift
+//  
+//
+//  Created by Max Nuding on 05.12.21.
+//
+
+import Foundation
+import Runner
+
+Runner(target: Day06.self, day: "06").run()