习题链接：LeetCode 1944. 队列中可以看到的人数
A co-CEO model divides responsibility, accountability, and, ultimately, the burden between two people.
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在最极端的案例里，一个代理网络同时管理超过 2 万个虚假账号，还把蒸馏流量混入普通用户请求流里，用来规避检测算法。这种网络没有单点故障，封掉一个账号，马上换一个。
* At the end of this file, create a work in progress log, where you note what you already did, what is missing. Always update this log.
The old location-sharing option was only for a static point.