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Find the Lowest Common Ancestor (LCA) of two nodes in a binary tree.

LCA is the recursion classic that tests how you propagate information up from subtrees in a single pass. The signal is the post-order 'found in left, found in right' logic. Here is the answer plus the BST shortcut.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

LCA is the recursion classic that tests how you propagate information up from subtrees in a single pass. The signal is the post-order 'found in left, found in right' logic. Here is the answer plus the BST shortcut.

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