94,中序遍历二叉树,104,二叉树的最大深度,226,翻转二叉树
三题二叉树都是用的递归。/*** 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 righ…
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