Implement custom iterator classes

Q: Implement custom iterator classes

This question evaluates understanding of object-oriented design and the iterator pattern, including manual interface definition, concrete iterator implementations, traversal behavior, performance considerations, and the ability to produce unit tests.

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Question

Implement an iterator from scratch in a blank coding environment.

Define the iterator interface manually.

Implement two concrete iterator classes that satisfy three follow-up requirements (e.g., additional traversal features or performance guarantees).

Provide unit tests to validate the implementation.

Implement custom iterator classes

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