almostIncreasingSequence. swift

func almostIncreasingSequence(sequence: [Int]) -> Bool {
    if (isIncreasingSequence(sequence : sequence)) {
        return true;
    }

    for (n, c) in sequence.enumerated() {

        var tmpSequence = sequence.dropFirst(0); 
        tmpSequence = tmpSequence[n...1];
        if (isIncreasingSequence(sequence : Array<Int>(tmpSequence))) {
            return true;
        }

    }

    return false;
}

func isIncreasingSequence(sequence: [Int]) -> Bool {
        for (n, c) in sequence.enumerated() {
        if (sequence[n] >= sequence[n + 1]) {
            return false;
        }
    }

    return true;
}

//almostIncreasingSequence([1, 3, 2, 1]);