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Design a mutable integer set that supports snapshot isolation for independent iterators.
Iterators must reflect the set's state at creation time while preserving original insertion order.
Achieve amortized O(1) time complexity for mutations and O(N+M) space complexity overall.
What This Tests
Data structure design with versioning and state isolation
Efficient memory management and simulated garbage collection
Trade-off analysis between time and space complexity
Iterator pattern implementation with lazy evaluation
Common Patterns
Hashing
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