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| //: Playground - noun: a place where people can play | |
| import Cocoa | |
| func f1(x : Int) -> Int? { | |
| return (x == 3) ? 1 : 3 | |
| } | |
| func f2(x : Int) -> Int? { | |
| if x < 0 || x > 3 {return nil} | |
| return [3, 0, 1, 0][x - 1] | |
| } | |
| func f3(var x: Int) -> Int? { | |
| return x ^ (1 << 1) | |
| } | |
| func f4(x : Int) -> Int? { | |
| if ((x != 3) && (x != 1)) {return nil} | |
| let s = " 3 1" | |
| let index = advance(s.startIndex, x) | |
| return (s.substringFromIndex(index) as NSString).integerValue | |
| } | |
| func f5(x : Int) -> Int? { | |
| return [1:3, 3:1][x % 4] | |
| } | |
| func f6(x : Int) -> Int? { | |
| return Int(atan(pow(0.0, -(1.0 - Double(x))))) * 2 + 1 | |
| } | |
| func f7(x : Int) -> Int? { | |
| return lrint(asin(Double((x - 1) / 2))) + 1 | |
| } | |
| func f8(x : Int) -> Int? { | |
| if let i = first("\(x)".utf16) { | |
| return Int(sqrt(fmod(Double(i), 10.0))) | |
| } | |
| return nil | |
| } | |
| func f9(x : Int) -> Int? { | |
| return 4 - x | |
| } | |
| func fa(x : Int) -> Int? { | |
| var count = -1 | |
| for i in 0...1 { | |
| count += (x & 1 << i) != 0 ? 1 : 0 | |
| } | |
| return Int(cos(Double(count) * Double(M_PI))) + 2 | |
| } | |
| func fb(x: Int) -> Int? { | |
| var set = [1, 3] as Set<Int> | |
| set.remove(x) | |
| let y = set.removeFirst() | |
| return isEmpty(set) ? y : nil | |
| } | |
| func fc(x:Int)->Int{ | |
| typealias f = ()->Int | |
| var funcs = [Int : f]() | |
| funcs[1] = {3} | |
| funcs[3] = {1} | |
| return funcs[x]!() | |
| } | |
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