Moderator List Manager

Design a system to manage Reddit community moderators based on action logs.

Background: Reddit communities have moderators with a hierarchy. Senior moderators (added earlier) can remove junior ones. Moderators are ordered by when they were added.

Log Format: Each line: mod_given_access, action, mod_taking_action, timestamp

• action: "added" or "removed"

Part 1 - Basic Implementation:

1. ModList(log_string) - Constructor that parses log
2. can_remove_mod(user1, user2) - Can user2 remove user1? (user2 must be more senior)
3. get_mod_list() - Return list of all current moderators in order

Part 2 - Multiple Communities: Each community has its own mod list. Update methods to take community_id.

Part 3 - Demote Function: demote(user) - Move user down one position in the hierarchy. Example: [user_1, user_2, user_3] → demote(user_1) → [user_2, user_1, user_3]

Constraints:

• Timestamps are floats, in increasing order
• User can only be removed by someone added before them
• A removed user is no longer in the list