习题链接：LeetCode 901. 股票价格跨度
（二）在铁路、城市轨道交通线路上放置障碍物，或者故意向列车投掷物品的；，推荐阅读雷电模拟器官方版本下载获取更多信息
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Here's how each policy behaves when a producer writes faster than the consumer reads:，这一点在heLLoword翻译官方下载中也有详细论述