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2020/day2/main.swift

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+import Foundation
+
+let input = loadData(day: 2)
+
+var valids = 0
+var valid2 = 0
+
+var scanner = Scanner(string: input)
+while !scanner.isAtEnd {
+    guard let min = scanner.scanInt(),
+          scanner.scanString("-") != nil,
+          let max = scanner.scanInt(),
+          let character = scanner.scanCharacter(),
+          scanner.scanString(":") != nil,
+          let password = scanner.scanUpToCharacters(from: .newlines)
+    else {
+        fatalError("Invalid input");
+    }
+
+
+    let count = password.lazy.filter { $0 == character }.count
+
+    if min <= count && count <= max {
+        print("valid", min, max, character, password)
+        valids += 1
+    }
+
+    let first = password.index(password.startIndex, offsetBy: min - 1, limitedBy: password.endIndex).map { password[$0] }
+    let second = password.index(password.startIndex, offsetBy: max - 1, limitedBy: password.endIndex).map { password[$0] }
+
+    if (first == character || second == character) && first != second {
+        print("valid 2", password)
+        valid2 += 1
+    }
+
+}
+
+print("Valid old", valids)
+print("Valid new", valid2)