File System Permissions

Given a hierarchical structure of Teams, Folders, and Files with user access permissions, find the minimum set of top-level items that grant a user access to all their permitted resources.

Background:

• Each Team, Folder, and File has a list of user IDs who can access it
• If a user can access a higher-level item, they inherit access to all children
• Need to find the "roots" of the user's access tree

Challenge Notes:

• The three classes (Team, Folder, File) are similar but separate
• user_ids are lists, not sets (need to handle lookups)
• init_function stores state but doesn't return anything
• Build a unified tree structure from the disparate data

Requirements:

1. init_function(teams, folders, files) - Process and store the data
2. get_fewest(user_id) - Return minimum set of items for full access

Constraints:

• UUIDs are unique strings
• Users can have direct access at any level
• A user may have redundant access (both direct and inherited)