Kth Smallest in BST

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Solution Guide: Kth Smallest in BST

Approach

Inorder traversal of BST is sorted; return the k-th visited value.

Complexity Analysis

Time
O(h + k) average, O(n) worst
Space
O(h)

Pattern

Inorder Ranking

Why It Works

BST inorder order preserves ascending value sequence by definition.

Updated Feb 2026