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339. 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)

DFS

public int DepthSum(IList<NestedInteger> nestedList) {        return Depth(nestedList,1);    }        public int Depth(IList<NestedInteger> nestedList, int depth)    {        int res =0;        if(nestedList.Count()==0)        {            return res;        }        else        {            foreach(var n in nestedList)            {                if(n.IsInteger()) res += n.GetInteger()* depth;                else    res += Depth(n.GetList(),depth+1);            }            return res;        }    }

 

339. Nested List Weight Sum