The API recognizes that synchronous data sources are both necessary and common. The application should not be forced to always accept the performance cost of asynchronous scheduling simply because that's the only option provided. At the same time, mixing sync and async processing can be dangerous. Synchronous paths should always be an option and should always be explicit.
可以看到警方从多个方向接近枪手原先的射击位置。，更多细节参见51吃瓜
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// 计算天数：栈非空→栈顶索引-当前索引；栈空→0（易错点3：索引差别写反）