Leetcode-Algorithms Nested List Weight Sum

Given a nested list of integers, return the sum of all integers in the list weighted by their depth.

Each element is either an integer, or a list – whose elements may also be integers or other lists.

Example 1:
Given the list [[1,1],2,[1,1]], return 10. (four 1’s at depth 2, one 2 at depth 1)

Example 2:
Given the list [1,[4,[6]]], return 27. (one 1 at depth 1, one 4 at depth 2, and one 6 at depth 3; 1 + 4*2 + 6*3 = 27)

求一个nested list权重和.

# """# 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 Solution(object):    def depthSum(self, nestedList):        """        :type nestedList: List[NestedInteger]        :rtype: int        """        if len(nestedList) == 0:             return 0        stack = []        total_weight = 0        for lst in nestedList:            stack.append((lst,1))   #add initial weight for lst        while(stack):            lst, w = stack.pop(0)   #get 1st lst and the weight in stack            #if is integer, time weight and add to total weight            if lst.isInteger():                total_weight += lst.getInteger() * w            #if it is not integer, get all the elements in the list and each weight plus 1            else:                for child in lst.getList():                    stack.append((child,w+1))        return total_weight 

参考了leetcode的答案