check in

Author: gsbernstein

Diff for: .DS_Store

@@ -0,0 +1,122 @@
+import Foundation
+
+public let inputString = """
+132709
+102150
+126463
+85035
+77219
+86458
+119251
+121098
+118730
+122505
+127964
+68004
+55833
+77664
+142865
+124503
+115892
+87236
+122743
+127096
+94893
+62129
+56520
+117000
+81519
+121719
+96291
+96556
+79006
+137122
+124340
+125151
+51603
+50132
+67568
+132599
+149009
+60997
+99382
+96506
+57269
+118133
+115119
+126208
+101098
+60514
+146171
+70314
+76473
+51209
+99190
+57647
+126985
+142055
+99615
+146442
+129520
+145334
+57799
+87148
+118362
+80407
+106449
+57146
+129035
+60156
+120016
+147383
+68819
+83868
+81021
+131594
+137692
+86537
+110709
+127678
+106849
+137640
+108482
+131412
+70331
+90118
+117557
+117347
+84688
+108869
+145359
+127024
+100976
+90419
+53362
+106100
+129474
+56101
+99975
+79211
+99865
+121099
+74511
+123172
+"""
+
+
+let floatArray = inputString.split{ $0.isNewline }.compactMap{ Float($0) }
+//print(floatArray)
+let fuelArray = floatArray.map { module -> Float in
+    var total: Float = 0.0
+    var delta = module
+    while delta > 0 {
+        delta = floor(delta/3) - 2
+        if delta > 0 {
+            total += delta
+        }
+    }
+    return total
+}
+//print(fuelArray)
+let total = fuelArray.reduce(0, +)
+print(total)

Diff for: Advent of Code.playground/Pages/Day 1.xcplaygroundpage/Contents.swift

@@ -0,0 +1,26 @@
+var program: [Int] = [1,0,0,3,1,1,2,3,1,3,4,3,1,5,0,3,2,1,10,19,1,6,19,23,1,10,23,27,2,27,13,31,1,31,6,35,2,6,35,39,1,39,5,43,1,6,43,47,2,6,47,51,1,51,5,55,2,55,9,59,1,6,59,63,1,9,63,67,1,67,10,71,2,9,71,75,1,6,75,79,1,5,79,83,2,83,10,87,1,87,5,91,1,91,9,95,1,6,95,99,2,99,10,103,1,103,5,107,2,107,6,111,1,111,5,115,1,9,115,119,2,119,10,123,1,6,123,127,2,13,127,131,1,131,6,135,1,135,10,139,1,13,139,143,1,143,13,147,1,5,147,151,1,151,2,155,1,155,5,0,99,2,0,14,0]
+program[1] = 41
+program[2] = 12
+// var printProgram: [String] = program.map{String($0)}
+var position = 0
+while true {
+    // print(position, program)
+    var maybeoperation: ((Int, Int) -> Int)? = nil
+    switch program[position] {
+        case 1: maybeoperation = {$0+$1}
+        case 2: maybeoperation = {$0*$1}
+        case 99: print("halt"); break
+        default: print("error"); break
+    }
+    guard let operation = maybeoperation else { break }
+    let input1position = program[position+1]
+    let input2position = program[position+2]
+    let output = operation(program[input1position],program[input2position])
+    let destination = program[position+3]
+//    print(position,input1position,program[input1position],input2position,program[input2position],destination)
+    program[destination] = output
+    // printProgram[destination] = String(output) + "*"
+    // printProgram[position] += "#"
+    position += 4
+}
+print(program[0])

Diff for: Advent of Code.playground/Pages/Day 2.xcplaygroundpage/Contents.swift

@@ -0,0 +1,19 @@
+var count: Int = 0
+for num in 153517...630395 {
+    let numString = String(num)
+    guard String(numString.sorted()) == numString else { continue }
+    var charCount: [Character: Int] = [:]
+    
+    charCount = numString.reduce(into: charCount, { (result, element) in
+        result[element] = (result[element] ?? 0) + 1
+    })
+    let hasExactDouble: Bool = charCount.contains(where: { (_, count) -> Bool in
+        count == 2
+    })
+    guard hasExactDouble else { continue }
+
+    // guard Set(numString).count < 6 else {continue }
+    print("Hit! \(num)")
+    count += 1
+}
+print(count)

Diff for: Advent of Code.playground/Pages/Day 3.xcplaygroundpage/Contents.swift

@@ -0,0 +1,17 @@
+var count: Int = 0
+for num in 153517...630395 {
+    let hasdouble = false
+    let numString = String(num)
+    guard String(numString.sorted()) == numString else { continue }
+    let charCount = numString.reduce(into: [:], { result, element -> [Character:Int] in
+        result[element] = result[element] ?? 0 + 1
+    }
+    guard charCount.contains(where: { _, count -> Bool in
+        count == 2
+    }) else { continue }
+
+    // guard Set(numString).count < 6 else {continue }
+    print("Hit! \(num)")
+    count += 1
+}
+print(count)

Diff for: Advent of Code.playground/Pages/Day 4.xcplaygroundpage/Contents.swift

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='6.0' target-platform='ios'>
+    <pages>
+        <page name='Day 1'/>
+        <page name='Day 2'/>
+        <page name='Day 3'/>
+        <page name='Day 4'/>
+    </pages>
+</playground>

Diff for: Advent of Code.playground/contents.xcplayground

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Diff for: Advent of Code.playground/playground.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,86 @@
+let wire1path = "R990,U408,L583,U275,R483,U684,R437,U828,R108,U709,R378,U97,R252,D248,R413,U750,R428,D545,R570,D795,L204,D975,L557,U160,L861,U106,R436,U934,R81,D237,R660,U704,L451,U135,R282,D391,R39,D109,R125,U918,R214,U481,R853,U825,L91,D763,R335,U868,R42,U218,R152,D429,R414,D607,R28,U436,R7,U770,L215,D373,R209,U440,L536,U120,R900,D46,R635,D75,R58,U267,L581,U474,L858,U172,R725,U54,R291,D274,L583,D743,L130,U563,R137,U524,R659,D997,R131,D364,R883,D222,R628,U579,R801,D890,L519,D749,L620,U60,L759,D759,R376,U769,L910,D570,L814,U954,L153,D42,L784,D66,L844,U29,L794,D342,L924,U825,R447,U828,R404,D52,L330,D876,R125,U203,R245,U936,R866,D804,L186,U693,L620,D722,L32,D735,L191,D217,R68,U209,L736,U365,R280,U608,L450,D240,L282,U434,R589,U94,R470,D5,R49,U407,R552,D651,L69,U518,L358,D130,L710,D929,L315,U345,L511,D229,L557,U44,L890,D702,L181,D61,L208,U553,R878,U354,R787,U624,L961,D92,L891,U70,R203,U255,R532,U154,R299,U934,L609,D985,R115,U757,L13,D368,R936,D742,L412,U346,R56,D67,R371,D175,R868,U107,R806,D530,L40,U153,R374,D223,R517,D481,L194,U545,L356,U906,L999,D885,R967,U407,L141,U927,L489,U959,L992,U638,R332,U51,R256,U901,L891,U803,L885,U804,L242,U180,R277,U693,R935,D253,L68,D153,L614,D596,L999,D633,R995,D803,R17,U303,L569,U231,R737,D970,L45,D860,L225,D65,R41,D313,R698,D340,R599,D531,R55,D568,L911,D547,R196,D228,R868,D227,R262,U525,R104,D625,R570,U968,L276,D586,R690,D73,L336,U287,R294,U148,R781,D395,R478,D804,L429,U872,L351,D910,L597,U726,L320,D964,R928,U2,R540,D325,L222"
+let wire2path = "L998,U662,R342,U104,R140,U92,R67,D102,L225,U265,R641,U592,L295,D77,R415,U908,L640,D381,R312,U44,R424,D847,R892,D625,L337,D344,L917,D914,R127,D273,L627,U812,L200,D262,R226,U273,R911,U597,L888,U28,R921,U464,R254,U771,R818,D808,L239,D225,L280,U785,R322,D831,L622,U506,R139,U12,L491,D572,L172,U685,R54,U747,L812,D717,R874,U428,L867,U174,R360,D36,R217,D539,R210,D791,L82,D665,L190,D313,R649,U849,R63,U385,R105,U806,L207,U697,L823,D272,R830,D952,L386,U987,R775,U517,R139,D756,R545,D973,L743,D286,R261,U448,R946,U884,L903,D142,R28,D374,R259,U403,R689,D245,L302,D134,R710,U762,L67,D561,R801,D140,L887,U346,L227,U682,L350,D218,L711,U755,R226,D277,R114,D61,R992,U602,L191,U640,R733,D329,R862,U242,R754,D161,L52,D974,L251,D444,L552,U977,R174,U483,R869,D955,R925,U693,R610,D353,L843,U148,L866,D167,R412,D31,L847,D979,L282,D797,L837,U473,L402,U193,L332,D603,R48,D589,L760,D673,L843,U428,R779,D592,L688,D141,R851,D642,R559,U939,R999,D64,L297,U817,R670,U322,L768,D936,L39,U95,L342,U849,L692,U714,L732,D734,L373,U66,L577,D453,R336,U760,L217,U542,R920,U24,R529,D594,L34,D79,R877,D965,R932,U460,R879,U26,R803,U876,L780,U956,L235,D270,L315,D577,R835,U750,R414,D584,L828,U335,L563,U238,L815,U780,L550,U18,R743,D54,L816,U344,L806,D197,L518,D682,L835,U255,L666,U442,L286,D543,R102,D52,L570,D787,L763,D223,R279,D892,L828,D111,L554,D452,R575,D299,R932,D187,L439,U616,L278,D701,L360,D524,L891,U953,L896,U788,R776,U782,L71,D741,L652,U121,R669,D809,L662,U319,R392,D313,R870,U794,R937,D469,R571,D761,R947"
+
+struct Point {let x, y: Int}
+
+extension Point: Hashable {
+}
+
+extension Point {
+    public static func + (lhs: Point, rhs: Point) -> Point {
+        let x = lhs.x + rhs.x
+        let y = lhs.y + rhs.y
+        return Point(x: x, y: y)
+    }
+}
+
+extension Point: CustomStringConvertible {
+    var description: String {
+        return "(\(x), \(y))"
+    }
+}
+
+extension String {
+    func toArray() -> [Substring] {
+        return self.split{$0==","}
+    }
+}
+
+enum Direction: String {
+    case U, D, L, R
+
+    var delta: Point {
+        switch self {
+        case .U: return Point(x: 1, y: 0)
+        case .D: return Point(x: -1, y: 0)
+        case .L: return Point(x: 0, y: -1)
+        case .R: return Point(x: 0, y: 1)
+        }
+    }
+}
+
+struct Vector {
+    let direction: Direction
+    let distance: Int
+}
+
+extension Array where Element == Substring {
+    func toVectors() -> [Vector] {
+        self.map { string in
+            let dir = Direction(rawValue: String(string.first!))!
+            let dist = Int(string.dropFirst())!
+            return Vector(direction: dir, distance: dist)
+        } 
+    }
+}
+
+let path1 = wire1path.toArray().toVectors()
+let path2 = wire2path.toArray().toVectors()
+
+var points1: Set<Point> = []
+var currentPoint = Point(x: 0, y: 0)
+for vector in path1 {
+    var remainingDist = vector.distance
+    while remainingDist > 0 {
+        currentPoint = currentPoint + vector.direction.delta
+        points1.insert(currentPoint)
+        remainingDist-=1
+    }
+}
+// var collisions: Set<Point> = []
+var closestCollision: Int = 99999
+currentPoint = Point(x: 0, y: 0)
+for vector in path2 {
+    var remainingDist = vector.distance
+    while remainingDist > 0 {
+        currentPoint = currentPoint + vector.direction.delta
+        if points1.contains(currentPoint) {
+            // collisions.insert(currentPoint)
+            let distance = currentPoint.x + currentPoint.y
+            print("Hit at \(currentPoint), distance: \(distance)")
+            closestCollision = min(closestCollision, distance)
+        }
+        remainingDist-=1
+    }
+}
+print(closestCollision)

Diff for: Advent of Code.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?><playground version="5.0" target-platform="macos" executeOnSourceChanges="true">    <timeline fileName="timeline.xctimeline"/></playground>