Add 2016 solutions

2016/AoC2016.playground/Pages/Day 2.xcplaygroundpage/Contents.swift

@@ -0,0 +1,116 @@
+let input = """
+UULLULLUULLLURDLDUURRDRRLDURDULLRURDUDULLLUULURURLRDRRRRULDRUULLLLUUDURDULDRRDRUDLRRLDLUDLDDRURURUURRRDDDLLRUDURDULUULLRRULLRULDUDRDRLDLURURUDDUDLURUDUDURLURURRURLUDDRURRDLUURLLRURRDUDLULULUDULDLLRRRDLRDLDUDRDDDRRUURRRRRUURRDRRDLURDRRURDLLUULULLRURDLDDDRRLLRRUURULURUUDDLRRUDDRURUUDLRLRDLRURRRDULLDLRUDDUULRDULURUURDULUDLLRRLDDLRDLRUDRLDDRLRRRDURDULLRRRDRRLUURURDRRDRRLDLUDURURLDUURDRUDRDDRLDRRLDLURURULLUURUDUUDLRLL
+LLLULLULDDULRLLURLLLRUUDDLRUULRLULLDLLRRDRLRLRLLDRUUURULDRDDLUDLLDUDULLLRLULLLRULDRDRUDLLRLRLLUDULRRRLDRUULDDULLDULULLUDUDLDRDURDLDLLDUDRRRDLUURRUURULLURLDURLRRLLDDUUULDRLUUDUDLURLULUDURRDRLLDDDDDRRULLRLDULULDDRUURRDLUDDDUDURDDRDRULULLLLUURDURUUUULUDLRURRULRDDRURURLLRLUUDUUURDLLDDLUDRLLLUDLLLLULRLURDRRRDUUDLLDLDDDURRDDRURUURDDRURRLDDDURDLLUURUUULRLUURRUDRLLDLURDUDRLULDLRLULULUDDLRDUDRUDLUULUULDURDRRRRLRULLUDRDDRDLDUDRDRRLDLLLLUDDLRULDLLDDUULDDRRULRRUURUDRDURLLLDDUUDRUUDLULLDR
+UDUUULLDDDDLUDLDULRLRDLULLDDRULDURRLURRUDLRRUDURRDUDRRRUULRLLRLUDLDRRDUURDDRDRDUUUDUDLDLLRRLUURLUUUDDDUURLULURRLURRRDRDURURUDRLRUURUDRUDDDRDRDLDRDURDLDRRDUUDLLURLDDURRRLULDRDRLLRLLLRURLDURDRLDRUURRLDLDRLDDDRLDLRLDURURLLLLDDRDUDLRULULLRDDLLUDRDRRLUUULDRLDURURDUDURLLDRRDUULDUUDLLDDRUUULRRULDDUDRDRLRULUUDUURULLDLLURLRRLDDDLLDRRDDRLDDLURRUDURULUDLLLDUDDLDLDLRUDUDRDUDDLDDLDULURDDUDRRUUURLDUURULLRLULUURLLLLDUUDURUUDUULULDRULRLRDULDLLURDLRUUUDDURLLLLDUDRLUUDUDRRURURRDRDDRULDLRLURDLLRRDRUUUURLDRURDUUDLDURUDDLRDDDDURRLRLUDRRDDURDDRLDDLLRR
+ULDRUDURUDULLUDUDURLDLLRRULRRULRUDLULLLDRULLDURUULDDURDUUDLRDRUDUDDLDRDLUULRRDLRUULULUUUDUUDDRDRLLULLRRDLRRLUDRLULLUUUUURRDURLLRURRULLLRLURRULRDUURRLDDRRDRLULDDRRDRLULLRDLRRURUDURULRLUDRUDLUDDDUDUDDUDLLRDLLDRURULUDRLRRULRDDDDDRLDLRRLUUDLUURRDURRDLDLDUDRLULLULRLDRDUDLRULLULLRLDDRURLLLRLDDDLLLRURDDDLLUDLDLRLUULLLRULDRRDUDLRRDDULRLLDUURLLLLLDRULDRLLLUURDURRULURLDDLRRUDULUURRLULRDRDDLULULRRURLDLRRRUDURURDURDULURULLRLDD
+DURLRRRDRULDLULUDULUURURRLULUDLURURDDURULLRRUUDLRURLDLRUDULDLLRRULLLLRRLRUULDLDLLRDUDLLRLULRLLUUULULRDLDLRRURLUDDRRLUUDDRRUDDRRURLRRULLDDULLLURRULUDLRRRURRULRLLLRULLRRURDRLURULLDULRLLLULLRLRLLLDRRRRDDDDDDULUUDUDULRURDRUDRLUULURDURLURRDRRRRDRRLLLLUDLRRDURURLLULUDDLRLRLRRUURLLURLDUULLRRDURRULRULURLLLRLUURRULLLURDDDRURDUDDULLRULUUUDDRURUUDUURURRDRURDUDRLLRRULURUDLDURLDLRRRRLLUURRLULDDDUUUURUULDLDRLDUDULDRRULDRDULURRUURDU
+
+"""
+let inputTest = """
+ULL
+RRDDD
+LURDL
+UUUUD
+
+"""
+
+protocol KeyPad {
+    associatedtype Digit
+
+    var current: Digit { get }
+    mutating func up()
+    mutating func down()
+    mutating func left()
+    mutating func right()
+}
+
+func solve<T: KeyPad>(pad: T) -> [T.Digit] {
+    var pad = pad
+    var result: [T.Digit] = []
+    for char in input {
+        switch char {
+        case "U": pad.up()
+        case "D": pad.down()
+        case "L": pad.left()
+        case "R": pad.right()
+        case "\n": result.append(pad.current)
+        default: fatalError("Invalid input")
+        }
+    }
+    return result
+}
+
+struct Part1Pad: KeyPad {
+    var current: Int = 5
+
+    mutating func up() {
+        if current - 3 >= 1 {
+            current -= 3
+        }
+    }
+
+    mutating func down() {
+        if current + 3 <= 9 {
+            current += 3
+        }
+    }
+
+    mutating func left() {
+        if current != 1 && current != 4 && current != 7 {
+            current -= 1
+        }
+    }
+
+    mutating func right() {
+        if current != 3 && current != 6 && current != 9 {
+            current += 1
+        }
+    }
+}
+
+print("Part 1", solve(pad: Part1Pad()))
+
+struct Part2Pad: KeyPad {
+    let grid: [[Character]] = [
+        Array("##1##"),
+        Array("#234#"),
+        Array("56789"),
+        Array("#ABC#"),
+        Array("##D##"),
+    ]
+
+    var x = 0
+    var y = 2
+
+    var current: Character {
+        grid[y][x]
+    }
+
+
+    mutating func up() {
+        if y > 0 && grid[y - 1][x] != "#" {
+            y -= 1
+        }
+    }
+
+    mutating func down() {
+        if y < 4 && grid[y + 1][x] != "#" {
+            y += 1
+        }
+    }
+
+    mutating func left() {
+        if x > 0 && grid[y][x - 1] != "#" {
+            x -= 1
+        }
+    }
+
+    mutating func right() {
+        if x < 4 && grid[y][x + 1] != "#" {
+            x += 1
+        }
+    }
+}
+
+print("Part 2:", solve(pad: Part2Pad()))
+