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题目： Given a Binary Search Tree (BST), convert it to a Greater Tree such that every key of the original BST is changed to the original key plus sum of 阅读全文
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题目： Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Example 1: Input: root = [3,1,4,null,2], k = 1 3 阅读全文
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题目：Trim a Binary Search Tree Given a binary search tree and the lowest and highest boundaries as L and R, trim the tree so that all its elements lies 阅读全文