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Grokking the Coding Interview Patterns in Python

Solution: Two Sum IV - Input Is a BST

Explore the Two Sum IV problem by learning how to use breadth-first search to find two elements in a binary search tree that add up to a target sum k. This lesson guides you through implementing a solution with a set to track visited node values, enhancing your understanding of tree traversal and complement checks.

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Statement

Given the root of a binary search tree and an integer k, determine whether there are two elements in the BST whose sum equals k. Return TRUE if such elements exist or FALSE otherwise.

Constraints:

  • The number of nodes in the tree is in the range [1,103][1, 10^3].

  • −103≤-10^3 \leq ...