Implement an iterator class that supports next, hasNext, getState, and setState, then extend it to t

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Implement an iterator class that supports next, hasNext, getState, and setState, then extend it to treat a list of iterators as one continuous iterator with a global index.

Implement an iterator class that supports next, hasNext, getState, and setState, then extend it to treat a list of iterators as one continuous iterator with a global index.

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