Use a Breadth-First Search (BFS) starting from node 1 (or 0) to determine a traversal order and parent-child relationships.
Traverse the nodes in reverse BFS order (from leaves up to the root) to accumulate the sums. cut the tree hackerrank solution python
You are given a tree (a connected acyclic undirected graph) with $N$ nodes. Each node has a value associated with it (data value). You are also given $N-1$ edges describing the connections between these nodes. Use a Breadth-First Search (BFS) starting from node