Dict Bot
We are building a small chat bot that can receive messages and keep track of what everyone has said.
Given a sequence of messages, implement a function that processes each message and produces the corresponding bot outputs.
The bot should support the following message patterns:
- A message indicating that a user says something.
- A message indicating that a user is away.
- A message indicating that a user returns and updates their away status.
- A special message about meeting with Google Meet.
- A special message about tacos and how many a user has.
The bot must store messages and update user states accordingly.
The exact formatting of bot outputs should match the problem requirements.
这道题本质上是一个字符串解析与状态维护题：需要按顺序处理聊天消息，不同的消息模式，并维护每个用户的在线 / 离开状态以及附加信息。实现时通常会用字典分别记录用户当前是否 away、最近的留言内容，以及像 taco 数量这样的统计值。难点在于把输入消息拆分成固定格式并正确匹配分支，输出时要严格遵守题目要求的文案格式。
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