Implement day 25

Author: fwcd

day25/src/day25.swift

@@ -7,4 +7,13 @@ if args.count == 1 {
 }
 
 let rawInput = try String(contentsOfFile: args[1], encoding: .utf8)
-print("Input: \(rawInput)")
+let schematics = rawInput.split(separator: "\n\n")
+  .map { $0.replacing("\n", with: "") }
+  .map { $0.reduce(UInt64(0)) { ($0 << 1) | ($1 == "#" ? 1 : 0) } }
+
+let part1 = schematics
+  .enumerated()
+  .map { (i, s1) in schematics.dropFirst(i + 1).filter { s2 in s1 & s2 == 0 }.count }
+  .reduce(0, +)
+
+print("Part 1: \(part1)")