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Solution: Two Sum IV - Input Is a BST

Explore how to implement a breadth-first search to determine if two nodes in a binary search tree add up to a given integer. Understand using sets to track complements during traversal and analyze the time and space complexity of this approach.

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 [1,1 ...