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Design a flat-file storage system that supports adding files, copying them, and retrieving their sizes.
Strictly validate existence and uniqueness constraints for both source and target files during copy operations.
Treat all input paths as unique string identifiers without parsing directory hierarchies.
What This Tests
Hash Map utilization for fast lookups
System design and state management
Input validation and edge case handling
Time and space complexity optimization
Common Patterns
Hashing
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