Solution: Tree Diameter

Explore how to determine the diameter of an undirected tree using depth-first search (DFS). Learn the single DFS traversal technique that calculates the longest path by tracking top distances from nodes to their leaf descendants. Understand how to build adjacency lists, avoid revisits, and compute the maximum path length efficiently. This lesson also covers the time and space complexities involved, providing a solid foundation for solving tree diameter problems in coding interviews.