plain solution in python


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    M
    class Solution(object):
        def depthSum(self, nestedList):
            """
            :type nestedList: List[NestedInteger]
            :rtype: int
            """
            def findSum(nestedList, level):
                sum = 0
                for nestedInteger in nestedList:
                    if nestedInteger.isInteger():
                        sum += nestedInteger.getInteger() * level
                    else:
                        sum += findSum(nestedInteger.getList(), 1 + level)
                return sum
            return findSum(nestedList, 1)
    

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