10a

Package.swift

@@ -18,7 +18,8 @@ let package = Package(
             .executable(name: "06", targets: ["06"]),
             .executable(name: "07", targets: ["07"]),
             .executable(name: "08", targets: ["08"]),
-            .executable(name: "09", targets: ["09"])
+            .executable(name: "09", targets: ["09"]),
+            .executable(name: "10", targets: ["10"])
         ],
     dependencies: [
         // Dependencies declare other packages that this package depends on.
@@ -80,6 +81,13 @@ let package = Package(
         .executableTarget(
             name: "09",
             dependencies: [.targetItem(name: "Runner", condition: nil)]
+        ),
+        .executableTarget(
+            name: "10",
+            dependencies: [
+                .targetItem(name: "Runner", condition: nil),
+                .product(name: "Collections", package: "swift-collections"),
+            ]
         )
     ]
 )

Sources/10/10.swift

@@ -0,0 +1,81 @@
+//
+//  File.swift
+//
+//
+//  Created by Max Nuding on 05.12.21.
+//
+
+import Foundation
+import Runner
+import Collections
+
+struct Day10: Runnable {
+    let inputPath: String
+    
+    public func run() {
+        let input = try! String(contentsOfFile: inputPath)
+        let lines = input
+            .trimmingCharacters(in: .newlines)
+            .components(separatedBy: .newlines)
+            //.map { line in line.map { $0.wholeNumberValue! } }
+        var s = Deque<String.Element>()
+        var illegalCharacters = [String.Element]()
+        for (lineNumber, line) in lines.enumerated() {
+            for char in line {
+                if char.isClosing {
+                    if let popped = s.popFirst() {
+                        if let shouldBeClosedBy = popped.closedBy {
+                            if shouldBeClosedBy == char {
+                                continue // Valid chunk
+                            }
+                            print("Line: \(lineNumber): Expected \(shouldBeClosedBy), but found \(char) instead")
+                            illegalCharacters.append(char)
+                            break
+                        } else {
+                            print("\(popped) should be an opening character, but cannot find a fitting closing char. Line: \(lineNumber+1), char: \(char)")
+                        }
+                    } else {
+                        print("Found closing character \(char), but empty list!")
+                    }
+                }
+                s.prepend(char)
+            }
+        }
+        print(illegalCharacters.map{$0.score!}.reduce(0,+))
+    }
+    
+    
+}
+
+extension String.Element {
+    var isClosing: Bool { self == "]" || self == ")" || self == ">" || self == "}" }
+    var closedBy: String.Element? {
+        switch self {
+        case "[":
+            return "]"
+        case "(":
+            return ")"
+        case "{":
+            return "}"
+        case "<":
+            return ">"
+        default:
+            return nil
+        }
+    }
+        
+    var score: Int? {
+        switch self {
+        case ")":
+            return 3
+        case "]":
+            return 57
+        case "}":
+            return 1197
+        case ">":
+            return 25137
+        default:
+            return nil
+        }
+    }
+}

Sources/10/main.swift

@@ -0,0 +1,12 @@
+//
+//  File.swift
+//  
+//
+//  Created by Max Nuding on 05.12.21.
+//
+
+import Foundation
+import Runner
+
+//Runner(target: Day10.self, day: "10", isTest: true).run()
+Runner(target: Day10.self, day: "10", isTest: false).run()

Sources/Runner/Resources/input/10.txt

@@ -0,0 +1,90 @@
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Sources/Runner/Resources/input/10_test.txt

@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
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