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Solution: Two Sum IV - Input Is a BST

Explore how to solve the Two Sum IV problem in a binary search tree by using breadth-first search and a set to track complements. Learn to efficiently detect if any two nodes sum to a target value, understanding the time and space complexity of the approach.

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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 ...