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java solution

class Solution {public void flatten(TreeNode root) {//首先设置递归终止条件if(root == null) return;//分别递归处理左右子树，//递归需要先处理子问题（子树的拉平），然后才能处理当前问题（当前节点的指针调整）flatten(root.left);flatten(root.right);//存储右子树TreeNode tempRight = root.right;//然后把左子树挪到右子树root.right = root.left;root.left = null;//开始寻找右子树的最深最右节点TreeNode curr = root;while(curr.right != null) {curr = curr.right;}curr.right = tempRight;}
}