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Java-based LeetCode algorithm problem solutions, regularly updated
897\. Increasing Order Search Tree
Easy
Given the `root` of a binary search tree, rearrange the tree in **in-order** so that the leftmost node in the tree is now the root of the tree, and every node has no left child and only one right child.
**Example 1:**
![](https://assets.leetcode.com/uploads/2020/11/17/ex1.jpg)
**Input:** root = [5,3,6,2,4,null,8,1,null,null,null,7,9]
**Output:** [1,null,2,null,3,null,4,null,5,null,6,null,7,null,8,null,9]
**Example 2:**
![](https://assets.leetcode.com/uploads/2020/11/17/ex2.jpg)
**Input:** root = [5,1,7]
**Output:** [1,null,5,null,7]
**Constraints:**
* The number of nodes in the given tree will be in the range `[1, 100]`.
* `0 <= Node.val <= 1000`