Add 2019 solutions

2019/AoC.playground/Pages/Day 1.xcplaygroundpage/Contents.swift

@@ -0,0 +1,120 @@
+import Foundation
+
+let input = """
+110321
+61817
+107271
+126609
+84016
+119187
+53199
+117553
+83163
+69434
+62734
+76774
+75016
+126859
+114626
+70782
+102903
+105871
+108500
+149367
+99266
+131731
+86778
+110561
+116521
+138216
+55347
+135516
+126801
+124902
+103083
+130858
+54885
+126837
+71103
+143975
+135207
+77264
+149331
+85252
+78910
+84007
+123953
+87355
+113433
+57750
+78394
+106081
+110942
+118180
+71745
+60080
+56637
+105491
+111329
+71799
+59962
+60597
+75241
+102506
+75341
+129539
+71011
+127185
+51245
+144401
+78592
+116835
+52029
+134905
+80104
+146304
+113780
+108124
+131268
+124765
+78847
+76897
+56445
+116487
+62068
+125176
+122259
+134261
+101127
+127089
+55793
+113113
+132835
+118901
+59574
+113399
+73232
+93720
+144450
+129604
+101741
+108759
+55891
+52939
+"""
+
+func fuel(mass: Int) -> Int {
+    let requiredFuel = mass / 3 - 2
+    guard requiredFuel > 0 else {
+        return 0
+    }
+
+    return requiredFuel + fuel(mass: requiredFuel)
+}
+
+input.split(separator: "\n")
+    .compactMap { Int($0) }
+    .map { fuel(mass: $0) }
+    .reduce(0, { a, b -> Int in a + b })
+
+