06b

Package.swift

@@ -14,7 +14,8 @@ let package = Package(
             .executable(name: "02", targets: ["02"]),
             .executable(name: "03", targets: ["03"]),
             .executable(name: "04", targets: ["04"]),
-            .executable(name: "05", targets: ["05"])
+            .executable(name: "05", targets: ["05"]),
+            .executable(name: "06", targets: ["06"])
         ],
     dependencies: [
         // Dependencies declare other packages that this package depends on.
@@ -58,6 +59,10 @@ let package = Package(
                 .targetItem(name: "Runner", condition: nil)
             ],
             resources: []
+        ),
+        .executableTarget(
+            name: "06",
+            dependencies: [.targetItem(name: "Runner", condition: nil)]
         )
     ]
 )

Sources/06/06.swift

@@ -0,0 +1,41 @@
+//
+//  File.swift
+//
+//
+//  Created by Max Nuding on 05.12.21.
+//
+
+import Foundation
+import Runner
+
+struct Day06: Runnable {
+    let inputPath: String
+    
+    func run() {
+        let input = try! String(contentsOfFile: inputPath)
+        let internalCounters = input
+            .trimmingCharacters(in: .newlines)
+            .components(separatedBy: ",")
+            .map { Int($0)! }
+        run(fish: internalCounters, numDays: 80)
+        run(fish: internalCounters, numDays: 256)
+    }
+    
+    func run(fish: [Int], numDays: Int) {
+        var tmpFish = Dictionary(grouping: fish, by: { $0 }).mapValues { $0.count }
+        
+        for _ in 1...numDays {
+            var d = [Int:Int]()
+            for f in tmpFish.keys.filter({$0 >= 0}) {
+                d[f-1] = tmpFish[f]
+            }
+            let countPregnant = d[-1] ?? 0
+            d[8] = countPregnant
+            d[6] = (d[6] ?? 0) + countPregnant
+            d[-1] = 0
+            
+            tmpFish = d
+        }
+        print(tmpFish.values.reduce(0, +))
+    }
+}

Sources/06/main.swift

@@ -0,0 +1,11 @@
+//
+//  File.swift
+//  
+//
+//  Created by Max Nuding on 05.12.21.
+//
+
+import Foundation
+import Runner
+
+Runner(target: Day06.self, day: "06").run()

Sources/Runner/Resources/input/06.txt

@@ -0,0 +1 @@
+1,2,1,3,2,1,1,5,1,4,1,2,1,4,3,3,5,1,1,3,5,3,4,5,5,4,3,1,1,4,3,1,5,2,5,2,4,1,1,1,1,1,1,1,4,1,4,4,4,1,4,4,1,4,2,1,1,1,1,3,5,4,3,3,5,4,1,3,1,1,2,1,1,1,4,1,2,5,2,3,1,1,1,2,1,5,1,1,1,4,4,4,1,5,1,2,3,2,2,2,1,1,4,3,1,4,4,2,1,1,5,1,1,1,3,1,2,1,1,1,1,4,5,5,2,3,4,2,1,1,1,2,1,1,5,5,3,5,4,3,1,3,1,1,5,1,1,4,2,1,3,1,1,4,3,1,5,1,1,3,4,2,2,1,1,2,1,1,2,1,3,2,3,1,4,5,1,1,4,3,3,1,1,2,2,1,5,2,1,3,4,5,4,5,5,4,3,1,5,1,1,1,4,4,3,2,5,2,1,4,3,5,1,3,5,1,3,3,1,1,1,2,5,3,1,1,3,1,1,1,2,1,5,1,5,1,3,1,1,5,4,3,3,2,2,1,1,3,4,1,1,1,1,4,1,3,1,5,1,1,3,1,1,1,1,2,2,4,4,4,1,2,5,5,2,2,4,1,1,4,2,1,1,5,1,5,3,5,4,5,3,1,1,1,2,3,1,2,1,1

Sources/Runner/Resources/input/06_test.txt

@@ -0,0 +1 @@
+3,4,3,1,2