341.py

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sample 48 ms submission
# """
# 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):
        """
        Initialize your data structure here.
        :type nestedList: List[NestedInteger]
        """
        self.v=[]
        self.cur=0
        for ele in nestedList:
            self.build(ele)

    def build(self, nestedList):
        if nestedList.isInteger():
           self.v.append(nestedList.getInteger())
        else:
            for ele in nestedList.getList():
                self.build(ele)
                

    def next(self):
        """
        :rtype: int
        """
        ans=self.v[self.cur]
        self.cur+=1
        return ans
        

    def hasNext(self):
        """
        :rtype: bool
        """
        if self.cur<len(self.v):
            return True
        else:
            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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sample 17252 kb submission
# """
# 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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