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2020/day6/main.swift

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+import Foundation
+
+var input = loadData(day: 6)
+
+let scanner = Scanner(string: input)
+scanner.charactersToBeSkipped = nil
+
+var count = 0
+var countB = 0
+var currentGroup: [Character:Int] = [:]
+var peopleInGroup = 0
+
+repeat {
+    guard let answers = scanner.scanUpToString("\n") else { fatalError() }
+    peopleInGroup += 1
+    _ = scanner.scanString("\n")
+
+    for answer in answers {
+        currentGroup[answer, default: 0] += 1
+    }
+
+    if scanner.isAtEnd || scanner.scanString("\n") != nil {
+        count += currentGroup.count
+
+        countB += currentGroup.lazy.filter { $1 == peopleInGroup }.count
+
+        currentGroup.removeAll(keepingCapacity: true)
+        peopleInGroup = 0
+    }
+
+} while !scanner.isAtEnd
+
+print("count", count)
+print("part 2", countB)