13a

Package.swift

@@ -21,7 +21,8 @@ let package = Package(
             .executable(name: "09", targets: ["09"]),
             .executable(name: "10", targets: ["10"]),
             .executable(name: "11", targets: ["11"]),
-            .executable(name: "12", targets: ["12"])
+            .executable(name: "12", targets: ["12"]),
+            .executable(name: "13", targets: ["13"])
         ],
     dependencies: [
         // Dependencies declare other packages that this package depends on.
@@ -101,6 +102,13 @@ let package = Package(
                 .targetItem(name: "Runner", condition: nil),
                 .product(name: "Collections", package: "swift-collections")
             ]
+        ),
+        .executableTarget(
+            name: "13",
+            dependencies: [
+                .targetItem(name: "Runner", condition: nil),
+                .product(name: "Collections", package: "swift-collections")
+            ]
         )
     ]
 )

Sources/13/13.swift

@@ -0,0 +1,147 @@
+//
+//  File.swift
+//
+//
+//  Created by Max Nuding on 12.12.21.
+//
+
+import Foundation
+import Runner
+import Collections
+
+struct Coord: Hashable {
+    var x: Int
+    var y: Int
+    
+    init(x: Int, y: Int) {
+        self.x = x
+        self.y = y
+    }
+    
+    init(line: String) {
+        let parts = line.split(separator: ",").map { Int($0)! }
+        x = parts.first!
+        y = parts.last!
+    }
+    
+    func foldingUp(by y: Int) -> Coord {
+        guard self.y > y else {
+            return self
+        }
+        return Coord(x: x, y: y - (self.y - y))
+    }
+    
+    func foldingLeft(by x: Int) -> Coord {
+        guard self.x > x else {
+            return self
+        }
+        return Coord(x: x - (self.x - x), y: y)
+    }
+    
+    func folding(by instruction: FoldingInstruction) -> Coord {
+        switch instruction {
+        case .up(let y):
+            return foldingUp(by: y)
+        case .left(let x):
+            return foldingLeft(by: x)
+        }
+    }
+    
+    /*mutating func foldUp(by y: Int) {
+        guard self.y > y else {
+            return
+        }
+        self.y = y - (self.y - y)
+    }
+    
+    mutating func foldLeft(by x: Int) {
+        guard self.x > x else {
+            return
+        }
+        self.x = x - (self.x - x)
+    }
+    
+    mutating func fold(by instruction: FoldingInstruction) {
+        switch instruction {
+        case .up(let y):
+            foldUp(by: y)
+        case .left(let x):
+            foldLeft(by: x)
+        }
+    }*/
+}
+
+
+
+enum FoldingInstruction {
+    case up(y: Int)
+    case left(x: Int)
+    
+    init?(line: String) {
+        let i = line.split(separator: " ").last!.split(separator: "=")
+        let coord = Int(i.last!)!
+        switch i.first {
+        case "x":
+            self = .left(x: coord)
+        case "y":
+            self = .up(y: coord)
+        default:
+            return nil
+        }
+    }
+}
+
+class Field {
+    var coords = [Coord]()
+}
+
+class Day13: Runnable {
+    let inputPath: String
+    //var field = [String:Cave]()
+    
+    required init(inputPath: String) {
+        self.inputPath = inputPath
+    }
+    
+    public func run() {
+        let input = try! String(contentsOfFile: inputPath)
+        let parts = input
+            .trimmingCharacters(in: .newlines)
+            //.components(separatedBy: .newlines)
+            .components(separatedBy: "\n\n")
+        var dots = parts.first!
+            .components(separatedBy: .newlines)
+            .map(Coord.init)
+        let instructions = parts.last!
+            .components(separatedBy: .newlines)
+            .map { FoldingInstruction(line: $0)! }
+        
+        //printDots(dots: dots)
+        //print("")
+        
+        for instruction in instructions {
+            //dots.forEach { $0.fold(by: instruction) }
+            dots = dots.map { $0.folding(by: instruction) }
+            //print(instruction)
+            //printDots(dots: dots)
+            print(Set(dots).count)
+            //print("")
+            break
+        }
+        /*print(dots.count)
+        print(Set(dots).count)
+        print(parts)*/
+        
+    }
+    
+    func printDots(dots:[Coord]) {
+        let maxX = dots.map {$0.x}.max()!
+        let maxY = dots.map {$0.y}.max()!
+        for x in 0...maxX {
+            for y in 0...maxY {
+                print(dots.contains(Coord(x: x, y: y)) ? "#" : ".", terminator: "")
+            }
+            print("")
+        }
+    }
+}

Sources/13/main.swift

@@ -0,0 +1,12 @@
+//
+//  File.swift
+//  
+//
+//  Created by Max Nuding on 05.12.21.
+//
+
+import Foundation
+import Runner
+
+//Runner(target: Day13.self, day: "13", isTest: true).run()
+Runner(target: Day13.self, day: "13", isTest: false).run()

Sources/Runner/Resources/input/13.txt

@@ -0,0 +1,812 @@
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+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6

Sources/Runner/Resources/input/13_test.txt

@@ -0,0 +1,21 @@
+6,10
+0,14
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+0,3
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+4,11
+6,0
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+4,1
+0,13
+10,12
+3,4
+3,0
+8,4
+1,10
+2,14
+8,10
+9,0
+
+fold along y=7
+fold along x=5