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Quick Summary
Model entity relationships as a directed graph to track permission flows.
Identify the single user who can reach every camera through ownership and group membership.
Use graph traversal to compute reachable entities per user and compare against the complete camera set.
What This Tests
Graph modeling from flat relational data
Breadth-first search and reachability analysis
Set operations and collection comparison
Handling acyclic hierarchical structures
Common Patterns
Graph Traversal
BFS
Hashing
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permissions =
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