Add 2019 solutions

2019/AoC.playground/Pages/Day 2.xcplaygroundpage/Contents.swift

@@ -0,0 +1,41 @@
+let program = [1,0,0,3,1,1,2,3,1,3,4,3,1,5,0,3,2,10,1,19,1,5,19,23,1,23,5,27,1,27,13,31,1,31,5,35,1,9,35,39,2,13,39,43,1,43,10,47,1,47,13,51,2,10,51,55,1,55,5,59,1,59,5,63,1,63,13,67,1,13,67,71,1,71,10,75,1,6,75,79,1,6,79,83,2,10,83,87,1,87,5,91,1,5,91,95,2,95,10,99,1,9,99,103,1,103,13,107,2,10,107,111,2,13,111,115,1,6,115,119,1,119,10,123,2,9,123,127,2,127,9,131,1,131,10,135,1,135,2,139,1,10,139,0,99,2,0,14,0]
+
+
+
+func run(a: Int, b: Int) -> Int {
+    var memory = program
+
+    memory[1] = a
+    memory[2] = b
+
+    var pc = 0
+
+    loop: while(true) {
+        switch memory[pc] {
+        case 1:
+            memory[memory[pc + 3]] = memory[memory[pc + 1]] + memory[memory[pc + 2]]
+
+        case 2:
+            memory[memory[pc + 3]] = memory[memory[pc + 1]] * memory[memory[pc + 2]]
+
+        case 99:
+            break loop
+
+        default:
+            fatalError()
+
+        }
+        pc += 4
+    }
+
+    return memory[0]
+}
+
+for a in 0...99 {
+    for b in 0...99 {
+        if  run(a: a, b: b) == 19690720 {
+            print (100 * a + b)
+        }
+    }
+}
+