CONCEPT BLOGS
Multi-phase guides with mental models, worked examples, diagrams, and real edge cases — the public form of Learnisim AI's conceptual learning. Read here; train it interactively in the app.
Trace DFS and BFS flood fill on a 4×5 grid with two land blobs. Master the spatial counting dilemma and graph component mental models.
![LCA of 5 and 1, then of 5 and 4, in [3,5,1,6,2,0,8] with 2 having 7,4 overview diagram](/blogs/lca-in-a-binary-tree-explained-tracing-5-and-4-in-3-5-1-6-2-0-8/diagrams/hero.svg)
Master LCA in a binary tree (not BST) by tracing nodes 5, 1, and 4 in [3,5,1,6,2,0,8]. Understand the bottom-up DFS mental model and handle missing nodes.
Master binary tree diameter by tracing a path that bypasses the root entirely through node 2. Understand recursive height accumulation with a worked example.
