Top View of Binary Tree | Level Order Traversal

This article discusses a problem where you need to find the top view of a binary tree, which involves returning the nodes visible when the tree is viewed from the top. The top view of a binary tree is achieved by storing the first node encountered for each horizontal distance. A time complexity of O(N log N) and space complexity of O(N) is required for this approach. The optimal solution involves using a level order traversal and a TreeMap to store the nodes for each horizontal distance.