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# """
# This is the interface that allows for creating nested lists.
# You should not implement it, or speculate about its implementation
# """
# class NestedInteger(object):
# def isInteger(self):
# """
# @return True if this NestedInteger holds a single integer, rather than a nested list.
# :rtype bool
# """
#
# def getInteger(self):
# """
# @return the single integer that this NestedInteger holds, if it holds a single integer
# Return None if this NestedInteger holds a nested list
# :rtype int
# """
#
# def getList(self):
# """
# @return the nested list that this NestedInteger holds, if it holds a nested list
# Return None if this NestedInteger holds a single integer
# :rtype List[NestedInteger]
# """
class NestedIterator(object):
def __init__(self, nestedList):
self.stack = [[nestedList, 0]]
def next(self):
self.hasNext()
nestedList, i = self.stack[-1]
self.stack[-1][1] += 1
return nestedList[i].getInteger()
def hasNext(self):
s = self.stack
while s:
nestedList, i = s[-1]
if i == len(nestedList):
s.pop()
else:
x = nestedList[i]
if x.isInteger():
return True
s[-1][1] += 1
s.append([x.getList(), 0])
return False
# Your NestedIterator object will be instantiated and called as such:
# i, v = NestedIterator(nestedList), []
# while i.hasNext(): v.append(i.next())
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