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Quick Summary

Manage hierarchical permissions where granting or revoking affects a region and all its descendants.
Track chronological operations per advertiser to resolve overlapping grants and revokes.
Query access status by traversing from a target region up to the hierarchy root.

What This Tests

Tree construction and parent-child relationship mapping
State tracking with timestamps or versioning
Path-based querying in hierarchical structures
Handling invalid inputs and edge cases gracefully

Common Patterns

Graph Traversal

Hashing

DFS/BFS

Test Cases

Input

Output

Expected