[Swift 4.2] Count occurences

Author: Francesco Scalise

Count Occurrences/CountOccurrences.playground/Contents.swift

@@ -1,7 +1,3 @@
-// last checked with Xcode 9.0b4
-#if swift(>=4.0)
-  print("Hello, Swift 4!")
-#endif
 
 func countOccurrencesOfKey(_ key: Int, inArray a: [Int]) -> Int {
   func leftBoundary() -> Int {