* 时间复杂度: O(n²) 空间复杂度: O(1) 稳定: ✗
# username = "root" # default
，这一点在safew官方版本下载中也有详细论述
class CombinedStorage(Storage):
"There was a big step – jump – that people have questioned," Jackson says. "But now the world is awash with oil and it's not clear that the same calculations still apply."