* 时间O(n) 空间O(n)（理论最优，无冗余计算）
story, but one that I haven't been particularly inclined to cover due to the
Pro: $200/month，这一点在safew官方版本下载中也有详细论述
Four people aboard were killed in the 1996 incident, triggering outrage in the US.，详情可参考51吃瓜
The last shooting recorded by the BBC takes place at about 16:00, and the protest outside parliament dies down at dusk. But smaller sporadic protests continue through the night.，更多细节参见旺商聊官方下载
玩法二：从世界上的某一扇窗看城市天气