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EasyMeta Interview PrepDebuggingData Structures10mby ifdotpy

Chatroom Message

Fix bugs in a linked-list chat buffer

Overview

You are given a chat buffer implemented as a doubly-linked list with an index for fast lookups. The code has 3 bugs that cause incorrect behavior in message retrieval and deletion.

Bugs

The following methods have issues:

  • get_last_n() — returns messages in wrong order
  • hard_delete() — incomplete cleanup of internal data structures
  • get_unread_since() — off-by-one error in message filtering

Scoring

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