Leetcode 235. Lowest Common Ancestor of a Binary Search Tree
Given a BST and two nodes p and q, find their lowest common ancestor — the deepest node that is an ancestor of both. Leverage BST ordering to traverse from the root until you reach the first node where p and q fall on different sides (or equal the node), which is the LCA.
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Early January, 2026
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what happen if one of the element not in the tree?
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