Some optimisations

Package.swift

@@ -23,7 +23,10 @@ let package = Package(
             .executable(name: "11", targets: ["11"]),
             .executable(name: "12", targets: ["12"]),
             .executable(name: "13", targets: ["13"]),
-            .executable(name: "14", targets: ["14"])
+            .executable(name: "14", targets: ["14"]),
+            .executable(name: "15", targets: ["15"]),
+            .executable(name: "16", targets: ["16"]),
+            .executable(name: "17", targets: ["17"])
         ],
     dependencies: [
         // Dependencies declare other packages that this package depends on.
@@ -111,6 +114,20 @@ let package = Package(
         .executableTarget(
             name: "14",
             dependencies: [ .targetItem(name: "Runner", condition: nil) ]
+        ),
+        .executableTarget(
+            name: "15",
+            dependencies: [ .targetItem(name: "Runner", condition: nil),
+                            .product(name: "Collections", package: "swift-collections")]
+        ),
+        .executableTarget(
+            name: "16",
+            dependencies: [ .targetItem(name: "Runner", condition: nil) ]
+        ),
+        .executableTarget(
+            name: "17",
+            dependencies: [ .targetItem(name: "Runner", condition: nil),
+                            .product(name: "Collections", package: "swift-collections")]
         )
     ]
 )

Sources/15/15.swift

@@ -0,0 +1,152 @@
+//
+//  File.swift
+//
+//
+//  Created by Max Nuding on 15s.12.21.
+//
+
+import Foundation
+import Runner
+import Collections
+
+typealias ThreatLevel = Int
+
+struct Coord: Hashable, CustomStringConvertible {
+    let row: Int
+    let col: Int
+    
+    var description: String { "(\(row), \(col))" }
+    
+    func neighbors() -> [Coord] {
+        [
+            Coord(row: row-1, col: col),
+            Coord(row: row, col: col+1),
+            Coord(row: row+1, col: col),
+            Coord(row: row, col: col-1)
+        ]
+    }
+}
+
+class Day15: Runnable {
+    let inputPath: String
+    var lastRow: Int = 0
+    var lastCol: Int = 0
+    var parts = [[ThreatLevel]]()
+    var neighbors = [Coord: [Coord]]()
+    
+    required init(inputPath: String) {
+        self.inputPath = inputPath
+    }
+    
+    private func expandMap() {
+        var tmpParts = parts
+        for (rowNum, row) in tmpParts.enumerated() {
+            let newRow = [Int](0...4).flatMap { cr in
+                row.map { rv in cr + rv }.map { $0 > 9 ? $0 - 9 : $0 }
+            }
+            parts[rowNum] = newRow
+        }
+        
+        tmpParts = parts
+        for num in 1...4 {
+            for i in tmpParts.indices {
+                let tr = tmpParts[i]
+                let ntr = tr.map { $0 + num }.map { $0 > 9 ? $0 - 9 : $0 }
+                parts.append(ntr)
+            }
+        }
+        
+        lastRow = parts.count - 1
+        lastCol = (parts.first?.count ?? 0) - 1
+    }
+    
+    public func run() {
+        let input = try! String(contentsOfFile: inputPath)
+        parts = input
+            .trimmingCharacters(in: .newlines)
+            .components(separatedBy: .newlines)
+            .map { Array($0) }
+            .map { ar in ar.map {c in ThreatLevel(c.description)!} }
+        lastRow = parts.count - 1
+        lastCol = (parts.first?.count ?? 0) - 1
+        
+        calculateSafestPath()
+        expandMap()
+        neighbors = [Coord: [Coord]]()
+        calculateSafestPath()
+    }
+    
+    private func calculateSafestPath() {
+        // Distances to startNode
+        var totalThreatLevel = [Coord: ThreatLevel]()
+        
+        var unvisited = Set(parts.enumerated().flatMap {row in
+            row.element.indices.map { col in
+                Coord(row: row.offset, col: col)
+            }
+        })
+        
+        /* Keep a seperate dictionary, to calculate which coordinates have a set threat level
+         * a.k.a total distance to start
+         * This allows to find the next coordinate to check fairly quickly, by just
+         * looking at the minmum key in this.
+         * I initially tried a PriorityQueue, but my implementation was pretty slow and it spent too much time sorting
+         */
+        var threatLevelDistrubution = [ThreatLevel: Set<Coord>]()
+        let startNode = Coord(row: 0, col: 0)
+        totalThreatLevel[startNode] = 0
+        threatLevelDistrubution[Int.max] = unvisited
+        threatLevelDistrubution[Int.max]!.remove(startNode)
+        threatLevelDistrubution[0] = Set([startNode])
+        
+        while let threatLevel = threatLevelDistrubution.keys.min() {
+            let currentNode = threatLevelDistrubution[threatLevel]!.first!
+            unvisited.remove(currentNode)
+            threatLevelDistrubution[threatLevel]!.remove(currentNode)
+            
+            // Remove key from dictionary if not coords are left for a specific threat level
+            if threatLevelDistrubution[threatLevel]!.isEmpty {
+                threatLevelDistrubution.removeValue(forKey: threatLevel)
+            }
+            
+            if neighbors[currentNode] == nil {
+                neighbors[currentNode] = currentNode
+                    .neighbors()
+                    .filter {
+                        $0.col >= 0 && $0.col <= lastCol && $0.row >= 0 && $0.row <= lastRow
+                    }
+            }
+            var adjacent = neighbors[currentNode]!
+            neighbors[currentNode] = adjacent
+            adjacent = adjacent
+                .filter {
+                    unvisited.contains($0)
+                }
+            let currentThreatLevel = totalThreatLevel[currentNode, default: Int.max]
+            for a in adjacent {
+                let testCost = parts[a] + currentThreatLevel
+                let currentCost = totalThreatLevel[a, default: Int.max]
+                if currentCost > testCost {
+                    totalThreatLevel[a] = testCost
+                    threatLevelDistrubution[currentCost]!.remove(a)
+                    threatLevelDistrubution[testCost, default: Set<Coord>()].insert(a)
+                    
+                    // Remove key from dictionary if not coords are left for a specific threat leveli
+                    if threatLevelDistrubution[currentCost]!.isEmpty {
+                        threatLevelDistrubution.removeValue(forKey: currentCost)
+                    }
+                }
+            }
+        }
+        print(totalThreatLevel[Coord(row: lastRow, col: lastCol)]!)
+    }
+}
+
+extension Array where Element == Array<Int> {
+    subscript(coord: Coord) -> Int {
+        get { self[coord.row][coord.col] }
+        set(newValue) {
+            self[coord.row][coord.col] = newValue
+        }
+    }
+}

Sources/15/main.swift

@@ -0,0 +1,12 @@
+//
+//  File.swift
+//  
+//
+//  Created by Max Nuding on 15.12.21.
+//
+
+import Foundation
+import Runner
+
+//Runner(target: Day15.self, day: "15", isTest: true).run()
+Runner(target: Day15.self, day: "15", isTest: false).run()

Sources/16/16.swift

@@ -0,0 +1,191 @@
+//
+//  File.swift
+//
+//
+//  Created by Max Nuding on 15.12.21.
+//
+
+import Foundation
+import Runner
+
+
+enum OperatorType: Int {
+    case sum = 0
+    case product = 1
+    case minimum = 2
+    case maximum = 3
+    case value = 4
+    case greaterThan = 5
+    case lessThan = 6
+    case equal = 7
+}
+
+protocol Packet {
+    var version: Int { get }
+    
+    func getTotalVersion() -> Int
+    func getValue() -> Int
+}
+
+struct ValuePacket: Packet {
+    let version: Int
+    let value: Int
+    
+    func getTotalVersion() -> Int { version }
+    func getValue() -> Int { value }
+}
+
+struct OperatorPacket: Packet {
+    let type: OperatorType
+    let version: Int
+    let subPackets: [Packet]
+    
+    func getTotalVersion() -> Int { version + subPackets.map { $0.getTotalVersion() }.reduce(0, +) }
+    func getValue() -> Int {
+        let spValues = subPackets.map { $0.getValue() }
+        switch type {
+        case .sum:
+            return spValues.reduce(0, +)
+        case .product:
+            return spValues.reduce(1, *)
+        case .minimum:
+            return spValues.min()!
+        case .maximum:
+            return spValues.max()!
+        case .greaterThan:
+            return spValues.first! > spValues.last! ? 1 : 0
+        case .lessThan:
+            return spValues.first! < spValues.last! ? 1 : 0
+        case .equal:
+            return spValues.first! == spValues.last! ? 1 : 0
+        case .value:
+            fatalError()
+        }
+    }
+}
+
+class Day16: Runnable {
+    let inputPath: String
+    
+    required init(inputPath: String) {
+        self.inputPath = inputPath
+    }
+    
+    public func run() {
+        let input = try! String(contentsOfFile: inputPath)
+        let parts = input
+            .trimmingCharacters(in: .newlines)
+        let bytes = parts.bits().joined()
+        let packets = parsePacket(bytes: bytes)
+        let p: Packet = packets.0
+        print(p.getTotalVersion())
+        print(p.getValue())
+    }
+    
+    func parsePacket<S>(bytes: S) -> (Packet, S.SubSequence) where S:StringProtocol {
+        let version = bytes[bytes.startIndex..<bytes.index(bytes.startIndex, offsetBy: 3)].binaryToDecimal()
+        let typeId = bytes[bytes.index(bytes.startIndex, offsetBy: 3)..<bytes.index(bytes.startIndex, offsetBy: 6)].binaryToDecimal()
+        var value: Packet
+        var reminder: S.SubSequence
+        switch typeId {
+        case 4:
+            let (v, r) = parseLiteralPacketValue(bytes: bytes)
+            value = ValuePacket(version: version, value: v)
+            reminder = r
+        default:
+            let (v, r) = parseOperatorPacker(bytes: bytes)
+            value = OperatorPacket(type: OperatorType(rawValue: typeId)!, version: version, subPackets: v)
+            reminder = r
+        }
+        return (value, reminder)
+    }
+    
+    func parseOperatorPacker<S>(bytes: S) -> ([Packet], S.SubSequence) where S:StringProtocol  {
+        let startNextBitsIndex = bytes.index(bytes.startIndex, offsetBy: 7)
+        let lengthTypeId = bytes[bytes.index(bytes.startIndex, offsetBy: 6)..<startNextBitsIndex].description
+        let isTotalLength = lengthTypeId == "0"
+        
+        let nextBitsLength = isTotalLength ? 15 : 11
+        let endNextBitsIndex = bytes.index(startNextBitsIndex, offsetBy: nextBitsLength)
+        let nextBits = bytes[startNextBitsIndex..<endNextBitsIndex]
+        
+        var number = nextBits.binaryToDecimal()
+        var reminder = bytes[endNextBitsIndex...]
+        var subPackets = [Packet]()
+        
+        while number > 0 {
+            let (p, rem) = parsePacket(bytes: reminder)
+            number -= isTotalLength ? (reminder.count - rem.count) : 1
+            subPackets.append(p)
+            reminder = rem
+        }
+        return (subPackets, reminder)
+    }
+    
+    func parseLiteralPacketValue<S>(bytes: S) -> (Int, S.SubSequence) where S:StringProtocol  {
+        var index = bytes.index(bytes.startIndex, offsetBy: 6)
+        var ei = index
+        var bits: Substring = ""
+        var reminder: S.SubSequence = ""
+        while true {
+            let si = bytes.index(index, offsetBy: 1)
+            ei = bytes.index(si, offsetBy: 4)
+            bits += bytes[si..<ei]
+            if bytes[index] == "0" {
+                reminder = bytes[ei...]
+                break
+            }
+            index = bytes.index(ei, offsetBy: 0)
+        }
+        return (bits.binaryToDecimal(), reminder)
+    }
+}
+
+extension StringProtocol {
+    func bits() -> [String] {
+        self.map { $0.bits }
+    }
+    
+    func binaryToDecimal() -> Int { Int(self, radix: 2)! }
+}
+
+extension Character {
+    var bits: String  {
+        switch self.hexDigitValue! {
+        case 0:
+            return "0000"
+        case 1:
+            return "0001"
+        case 2:
+            return "0010"
+        case 3:
+            return "0011"
+        case 4:
+            return "0100"
+        case 5:
+            return "0101"
+        case 6:
+            return "0110"
+        case 7:
+            return "0111"
+        case 8:
+            return "1000"
+        case 9:
+            return "1001"
+        case 10:
+            return "1010"
+        case 11:
+            return "1011"
+        case 12:
+            return "1100"
+        case 13:
+            return "1101"
+        case 14:
+            return "1110"
+        case 15:
+            return "1111"
+        default:
+            fatalError()
+        }
+    }
+}

Sources/16/main.swift

@@ -0,0 +1,12 @@
+//
+//  File.swift
+//  
+//
+//  Created by Max Nuding on 15.12.21.
+//
+
+import Foundation
+import Runner
+
+//Runner(target: Day16.self, day: "16", isTest: true).run()
+Runner(target: Day16.self, day: "16", isTest: false).run()

Sources/17/17.swift

@@ -0,0 +1,95 @@
+//
+//  File.swift
+//
+//
+//  Created by Max Nuding on 17.12.21.
+//
+
+import Foundation
+import Runner
+import Collections
+
+struct Point:Hashable {
+    var x: Int
+    var y: Int
+}
+
+struct Area {
+    let topLeft: Point
+    let botRight: Point
+    
+    init(x: String, y: String) {
+        let xVals = x[x.index(x.startIndex, offsetBy: 2)...].components(separatedBy: "..").map { Int($0)! }
+        let yVals = y[y.index(y.startIndex, offsetBy: 2)...].components(separatedBy: "..").map { Int($0)! }
+        topLeft = Point(x: xVals.first!, y: yVals.last!)
+        botRight = Point(x: xVals.last!, y: yVals.first!)
+    }
+    
+    func contains(point: Point) -> Bool {
+        point.x >= topLeft.x && point.x <= botRight.x && point.y <= topLeft.y && point.y >= botRight.y
+    }
+    
+    func overshot(point: Point) -> Bool {
+        point.y < botRight.y || point.x > botRight.x
+    }
+}
+
+struct Probe {
+    var position = Point(x: 0, y: 0)
+    var velocity: Point
+    
+    mutating func move() {
+        position.x += velocity.x
+        position.y += velocity.y
+        if velocity.x < 0 {
+            velocity.x += 1
+        } else if velocity.x > 0 {
+            velocity.x -= 1
+        }
+        velocity.y -= 1
+    }
+}
+
+class Day17: Runnable {
+    let inputPath: String
+    
+    required init(inputPath: String) {
+        self.inputPath = inputPath
+    }
+    
+    public func run() {
+        let input = try! String(contentsOfFile: inputPath)
+        let parts = input
+            .trimmingCharacters(in: .newlines)
+            .components(separatedBy: ": ")
+            .last!
+            .components(separatedBy: ", ")
+        let area = Area(x: parts.first!, y: parts.last!)
+        
+        var maxY = Int.min
+        var found = [Point]()
+        found.reserveCapacity(3000)
+        for x in 0...500 {
+            for y in -500...500 {
+                let velocity = Point(x: x, y: y)
+                var probe = Probe(velocity: velocity)
+                var maxYCurrent = Int.min
+                repeat {
+                    probe.move()
+                    if probe.position.y > maxYCurrent {
+                        maxYCurrent = probe.position.y
+                    }
+                    if area.contains(point: probe.position) {
+                        if maxYCurrent > maxY {
+                            maxY = maxYCurrent
+                        }
+                        found.append(velocity)
+                        break
+                    }
+                } while !area.overshot(point: probe.position)
+            }
+        }
+        print(maxY)
+        print(Set(found).count)
+    }
+}

Sources/17/main.swift

@@ -0,0 +1,12 @@
+//
+//  File.swift
+//  
+//
+//  Created by Max Nuding on 17.12.21.
+//
+
+import Foundation
+import Runner
+
+//Runner(target: Day17.self, day: "17", isTest: true).run()
+Runner(target: Day17.self, day: "17", isTest: false).run()

Sources/Runner/Resources/input/15.txt

@@ -0,0 +1,100 @@
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Sources/Runner/Resources/input/15_test.txt

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Sources/Runner/Resources/input/16.txt

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Sources/Runner/Resources/input/16_test.txt

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Sources/Runner/Resources/input/17.txt

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Sources/Runner/Resources/input/17_test.txt

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