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Leetcode: 341. Flatten Nested List Iterator (링크)  # """# This is the interface that allows for creating nested lists.# You should not implement it, or speculate about its implementation# """#class NestedInteger:# def isInteger(self) -> bool:# """# @return True if this NestedInteger holds a single integer, rather than a nested list.# """## def getInteger(self) -> int:# ..