import Foundationfunc solution(_ left:Int, _ right:Int) -> Int { func solution2(num: Int) -> Int { var count = 0 for i in 1...num { if num % i == 0 { count += 1 } } return count } return Array(left...right).map { solution2(num: $0)%2==0 ? $0 : -$0 }.reduce(0, +)}