d03

day03/d03p1.swift

@@ -0,0 +1,8 @@
+import Foundation
+
+let answer = try String(contentsOfFile: CommandLine.arguments[1])
+    .matches(of: try Regex(#"mul\(([0-9]+),([0-9]+)\)"#))
+    .map { m in (Int(m.output[1].substring!), Int(m.output[2].substring!)) }
+    .map { a, b in a! * b! }
+    .reduce(0, +)
+print(answer)