Very Difficult Coding Question To Solve If You Have Never Seen it Before
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LeetCode 669. Trim a Binary Search Tree
Given the root of a binary search tree and the lowest and highest boundaries as low and high, trim the tree so that all its elements lies in [low, high]. Trimming the tree should not change the relative structure of the elements that will remain in the tree (i.e., any node's descendant should remain a descendant). It can be proven that there is a unique answer.
Return the root of the trimmed binary search tree. Note that the root may change depending on the given bounds.
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Time Complexity = O(n), where 'n' is the number of nodes
Time Complexity = O(h), where 'h' is the height of the tree
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