[codility] Binary Gap

/// max binary gap 구하기
func maxBinaryGap(_ input: Int) -> Int {
    let binaryString = String(input, radix: 2)
    print("[input] \(binaryString)")

    var maxGap: Int = 0
    var gapCounter: Int = 0
    binaryString.forEach {
        if $0 == "1" {
            if gapCounter != 0 {
                maxGap = max(maxGap, gapCounter)
            }
            gapCounter = 0
        } else {
            gapCounter += 1
        }
    }

    print ("[result] \(maxGap)")
    return maxGap
}

maxBinaryGap(2)
maxBinaryGap(529)
maxBinaryGap(1041)

결과

[input] 10
[result] 0
[input] 1000010001
[result] 4
[input] 10000010001
[result] 5