Days 1 and 2

Author: agentcooper

.gitignore

@@ -0,0 +1,5 @@
+*
+!.gitignore
+!*.swift
+!*.md
+!*.txt

01.swift

@@ -0,0 +1,28 @@
+import Foundation
+
+guard var input = try? String(contentsOf: URL(fileURLWithPath: "01.txt")) else {
+    fatalError("File error")
+}
+
+let groups = input.components(separatedBy: "\n\n")
+
+let elfs: [[Int]] = groups.map { group in
+    return group.components(separatedBy: .newlines).map { line in
+        guard let value = Int(line) else {
+            fatalError("Parse error")
+        }
+        return value
+    }
+}
+
+let sums = elfs.map { $0.reduce(0, +) }
+let topThree = sums.sorted().suffix(3)
+
+let answer1 = topThree.last!
+let answer2 = topThree.reduce(0, +)
+
+print(answer1)
+assert(answer1 == 69289)
+
+print(answer2)
+assert(answer2 == 205615)