Interview questions

Diameter of Binary Tree

Given the root of a binary tree, return the diameter — the maximum number of edges on any path between two nodes; the core challenge…

Companies: Meta, Oracle, Roblox

Binary Tree · Depth-First Search · DP on Trees · Tree

Last reported Sep 2026

Binary Tree Cameras

Place the minimum number of cameras on nodes of a binary tree so every node is monitored by a camera on itself, its parent, or…

Companies: Amazon, D. E. Shaw

Binary Tree · Depth-First Search · DP on Trees · Dynamic Programming

Last reported Aug 2026

Binary Tree Maximum Path Sum

Find the maximum sum of any non-empty connected path in a binary tree (nodes used at most once), where the path can start and end…