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Tutorials, guides, and insights to help you become a better developer.
LC 297 is a Hard but the insight is simple: null markers make any traversal unambiguous. Learn preorder DFS and BFS serialization, plus the BST shortcut for LC 449.
AdminMarch 13, 20268 min read
One BFS template, three interview problems. Level-order, zigzag traversal, and right side view all reduce to the same queue loop with a small variation each time.
AdminFebruary 5, 20265 min read
Post-order DFS, the global-state side-effect trick, and nested tree matching — four problems that teach you everything about recursive tree traversal in JavaScript.
AdminFebruary 3, 20266 min read