习题链接：LeetCode 853. 车队
If the A* calculation for a shortcut (in Step 3) finds it's now impassable, or if its actual detailed cost is significantly different (e.g., 20%) from the pre-calculated shortcut value:。搜狗输入法下载对此有专业解读
// Flush: finalize compression，推荐阅读heLLoword翻译官方下载获取更多信息
But is there a limit to how connected crowds really want to be?
// Producers are supposed to wait for the writer.ready