[LeetCode] Peeking Iterator 頂端迭代器
Given an Iterator class interface with methods: next() and hasNext(), design and implement a PeekingIterator that support the peek() operation ...
原文：[LeetCode] Flatten Nested List Iterator 壓平嵌套鏈表迭代器
Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list whose elements may also be integers or other lists. Example : Given the list , , , , ...
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