Binary Trees Q&A Session

Great question! DFS explores as far as possible along each branch before backtracking, using a stack (recursion). BFS explores all nodes at the current depth before moving to the next level, using a queue. DFS is better for searching deep structures, while BFS finds the shortest path in unweighted graphs.

A balanced binary tree has the property that for every node, the height difference between left and right subtrees is at most 1. You can check this recursively: calculate heights of subtrees and verify the balance condition at each node. Time complexity is O(n).