Recover Binary Search Tree
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Two elements of a binary search tree (BST) are swapped by mistake.
Recover the tree without changing its structure.
Note: A solution using O(n) space is pretty straight forward. Could you devise a constant space solution?
题意：
题目：恢复二叉排序数
二叉排序树中有两个节点被交换了，要求把树恢复成二叉排序树。
注意：你可以使用常量空间求解吗
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