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From this question:

You are given a CSV file with 3 columns — all integers:

id,parent,weight
10,30,1
30,0,10
20,30,2
50,40,3
40,30,4

0 is the assumed root node with weight 0

which describes a tree-like structure — each line is a node, ‘parent’ refers to ‘id’ of another node.

Print out, for each node, the total weight of a subtree below this node (by convention, the weight of a subtree for node X includes the own weight of X).

You may assume that the input comes pre-parsed as a sequence of Node objects
(substitute the appropriate syntax for java/python/c++):

Node {
int id;
int parent;
int weight;
// … you can add other fields right here, if necessary
}

implement the following:
public void printSubTreeWeight(List<Node> nodes) {
….}

……To be update