已排序数组，以相同元素为组拆分数组

SplitArray

extension Array {
    func split(where condation: (Element, Element) -> Bool) -> [[Element]] {
        var result: [[Element]] = self.isEmpty ? [] : [[self[0]]]
        for (previous, current) in zip(self, self.dropFirst()) {
            if (condation(previous, current)) {
                result.append([current])
            } else {
                result[result.endIndex - 1].append(current)
            }
        }
        return result
    }
}