leet-code/src/main/java/leetcode/editor/cn/IncreasingOrderSearchTree.java

//给你一棵二叉搜索树，请你 按中序遍历 将其重新排列为一棵递增顺序搜索树，使树中最左边的节点成为树的根节点，并且每个节点没有左子节点，只有一个右子节点。 
//
// 
//
// 示例 1： 
//
// 
//输入：root = [5,3,6,2,4,null,8,1,null,null,null,7,9]
//输出：[1,null,2,null,3,null,4,null,5,null,6,null,7,null,8,null,9]
// 
//
// 示例 2： 
//
// 
//输入：root = [5,1,7]
//输出：[1,null,5,null,7]
// 
//
// 
//
// 提示： 
//
// 
// 树中节点数的取值范围是 [1, 100] 
// 0 <= Node.val <= 1000 
// 
// Related Topics 树 深度优先搜索 递归 
// 👍 154 👎 0

package leetcode.editor.cn;

import com.code.leet.entiy.TreeNode;

//897:递增顺序搜索树
public class IncreasingOrderSearchTree {
    public static void main(String[] args) {
        //测试代码
        Solution solution = new IncreasingOrderSearchTree().new Solution();
    }
    //力扣代码
    //leetcode submit region begin(Prohibit modification and deletion)

    /**
     * Definition for a binary tree node.
     * public class TreeNode {
     * int val;
     * TreeNode left;
     * TreeNode right;
     * TreeNode() {}
     * TreeNode(int val) { this.val = val; }
     * TreeNode(int val, TreeNode left, TreeNode right) {
     * this.val = val;
     * this.left = left;
     * this.right = right;
     * }
     * }
     */
    class Solution {
        private TreeNode temp;

        public TreeNode increasingBST(TreeNode root) {
            TreeNode treeNode = new TreeNode(0);
            temp = treeNode;
            bst(root);
            return treeNode.right;
        }

        private void bst(TreeNode node) {
            if (node == null) {
                return;
            }
            bst(node.left);
            temp.right = node;
            node.left = null;
            temp = node;
            bst(node.right);
        }
    }
//leetcode submit region end(Prohibit modification and deletion)

}